Question

Rút gọn biểu thức:

A= \(\sqrt[3]{125x^3+75x^2+15x^2+1}\) - 5x

Answer 1

 Sửa `A = root{3}{125x^3 +75x^2+15x^2 +1} -5x`

`A=root{3}{ (5x)^3 + 3* (5x)^2  *1 + 3*5x*1^2 *1^2 } -5x`

`A = root{3}{(5x+1)^3} -5x`

`A = 5x+1-5x =1`

Vậy `A=1`

Answer 2

\(=\sqrt[3]{\left(5x+1\right)^3}-5x=5x+1-5x=1\)