Question

tìm x biết: (2/3*x-1/5)^2=4/9

Answer 1

nhanh đc k

Answer 2

Tìm x, biết:

\(\left(\frac{2}{3}\cdot x-\frac{1}{5}\right)^2=\frac{4}{9}\)

\(\Rightarrow\left(\frac{2}{3}\cdot x-\frac{1}{5}\right)^2=\left(\frac{2}{3}\right)^2=\left(-\frac{2}{3}\right)^2\)

\(\Rightarrow\orbr{\begin{cases}\frac{2}{3}\cdot x-\frac{1}{5}=\frac{2}{3}\\\frac{2}{3}\cdot x-\frac{1}{5}=-\frac{2}{3}\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}\frac{2}{3}\cdot x=\frac{13}{15}\\\frac{2}{3}\cdot x=-\frac{7}{15}\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=\frac{13}{10}\\x=-\frac{7}{10}\end{cases}}\)