Question

( 1 - 2x ) ^4 = 1/128

giúp em ạ

giải theo cách toán 7 được ko ạ

Answer 1

\(\left(1-2x\right)^4=\dfrac{1}{128}\)

\(\Leftrightarrow\left[{}\begin{matrix}2x-1=\dfrac{\sqrt[4]{2}}{4}\\2x-1=\dfrac{-\sqrt[4]{2}}{4}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{\sqrt[4]{2}+1}{8}\\x=\dfrac{-\sqrt[4]{2}+1}{8}\end{matrix}\right.\)