H
huymi
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
tìm giá trị của a và b biết:
$\dfrac{3x+1}{(x+1)^3}=\dfrac{a}{(x+1)^3}+\dfrac{b}{(x+1)^2}$
$\dfrac{3x+1}{(x+1)^3}=\dfrac{a}{(x+1)^3}+\dfrac{b}{(x+1)^2}$
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