B
bavuongcualo
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
Mong cac bác làm giúp em bài này: Sử dụng đạo ham nha cac bác:
\sqrt{x^2 -2mx + 1} = m - 2 ( can bac 2 cua x^2-2mx +1 = m- 2)
\sqrt{x^2 -2mx + 1} = m - 2 ( can bac 2 cua x^2-2mx +1 = m- 2)
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