1.3. Những hằng đẳng thức đáng nhớ
1.3. Những hằng đẳng thức đáng nhớ
Chọn đáp án đúng nhất
Có bao nhiêu giá trị của thỏa mãn
C. 2
C. 2
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Ta có:
Vậy có hai giá trị của x thỏa mãn yêu cầu đề bài.
Vậy đáp án đúng là C.
Gợi ý
Sử dụng công thức
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
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Chọn đáp án đúng nhất
Cho
B.
Gợi ý
Sử dụng các hằng đẳng thức bình phương của một tổng, bình phương của một hiệu và hiệu hai bình phương để rút gọn.
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
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Chọn đáp án đúng nhất
Cho
A.
A.
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
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Ta có:
Vậy D = 29; C = 2 suy ra D = 14C + 1 (do 29 = 14.2 + 1)
Vậy đáp án đúng là A.
Gợi ý
Sử dụng các công thức
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
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Chọn đáp án đúng nhất
Cho
D.
Gợi ý
Sử dụng công thức
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
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Chọn đáp án đúng nhất
Viết biểu thức
A.
Gợi ý
Sử dụng công thức
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
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Chọn đáp án đúng nhất
Biểu thức
B.
Gợi ý
Sử dụng công thức binhg phương của một tổng
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
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Chọn đáp án đúng nhất
Khai triển
B.
Gợi ý
Sử dụng công thức bình phương của một hiệu
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
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![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
Chọn đáp án đúng nhất
Khai triển
A.
Gợi ý
Sử dụng công thức bình phương của một hiệu
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
Chọn đáp án đúng nhất
Khai triển
D.
Gợi ý
Sử dụng công thức hiệu hai bình phương
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
Chọn đáp án đúng nhất
Khai tiển
C.
Gợi ý
Sử dụng công thức hiệu hai bình phương.
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
Chọn đáp án đúng nhất
Chọn câu sai.
D.
D.
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
Ta có:
Suy ra đáp án D sai.
Vậy đáp án cần chọn là D.
Gợi ý
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
Chọn đáp án đúng nhất
Chọn đáp án đúng nhất.
B.
Gợi ý
Sử dụng hằng đẳng thức hiệu hai bình phương.
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
Chọn đáp án đúng nhất
Chọn đáp án đúng nhất.
A.
Gợi ý
Sử dụng công thức bình phương của một tổng.
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
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![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
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![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
Chọn đáp án đúng nhất
Khai triển
B.
Gợi ý
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
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![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
![](https://hocthattot.com/wp-content/themes/hocthattot/images/remove-icon.png)
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Chọn đáp án đúng nhất
Biểu thức
B. SAI
B. SAI
![](https://hocthattot.com/wp-content/themes/hocthattot/images/icon-check.png)
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Ta có:
Vậy A luôn dương với mọi x.
Vậy đáp án cần chọn là B.
Gợi ý
Bước 1: Đưa biểu thức A về dạng:
Bước 2: Sau đó đánh giá:
![](https://hocthattot.com/wp-content/themes/hocthattot/images/quesiton-icon.png)
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Chúc mừng bạn vừa hoàn thành 15 câu hỏi Luyện tập
Số câu hỏi trả lời đúng:
Số câu hỏi trả lời sai: