Question

1,Làm phép chia:

căn( a-1/a+2) : căn( a+2/ a^3 -3a^2+3a-1) với a>1

giúp mik với gấp lắm r:((

Answer 1

\(=\sqrt{\dfrac{a-1}{a+2}:\dfrac{a+2}{\left(a-1\right)^3}}\)

\(=\sqrt{\dfrac{\left(a-1\right)^4}{\left(a+2\right)^2}}=\dfrac{\left(a-1\right)^2}{a+2}\)

Answer 2

Với a > 1 

\(\sqrt{\dfrac{a-1}{a+2}}:\sqrt{\dfrac{a+2}{\left(a-1\right)^3}}=\dfrac{\sqrt{a-1}\left(a-1\right)\sqrt{a-1}}{a+2}=\dfrac{\left(a-1\right)^2}{a+2}\)