Question

1/2 x (2/3x + 1/2) = 2/3 x (x-1/3)

Answer 1

Lời giải:

$\frac{1}{2}\times (\frac{2}{3}\times x+\frac{1}{2})=\frac{2}{3}\times (x-\frac{1}{3})$

$\frac{1}{2}\times \frac{2}{3}\times x+\frac{1}{4}=\frac{2}{3}\times x-\frac{2}{9}$

$\frac{1}{3}\times x+\frac{1}{4}=\frac{2}{3}\times x-\frac{2}{9}$

$\frac{1}{4}+\frac{2}{9}=\frac{2}{3}\times x-\frac{1}{3}\times x$

$\frac{17}{36}=x\times \frac{1}{3}$

$x=\frac{17}{36}: \frac{1}{3}=\frac{17}{12}$