a) x - $\frac{1}{2}$ = $\frac{-3}{5}$
x = $\frac{-3}{5}$ + $\frac{1}{2}$
x = $\frac{-6}{10}$ + $\frac{5}{10}$
x = $\frac{-1}{10}$
b) x : $\frac{-27}{25}$= 7$\frac{4}{3}$
x : $\frac{-27}{25}$= $\frac{25}{3}$
x = $\frac{25}{3}$ x $\frac{-27}{25}$
x = -9
c) $\frac{2}{5}$x - $\frac{4}{3}$ = $\frac{-7}{6}$
$\frac{2}{5}$x = $\frac{-7}{6}$ + $\frac{4}{3}$
$\frac{2}{5}$x = $\frac{1}{6}$
x = $\frac{1}{6}$ : $\frac{2}{5}$ (phần này ko cần thiết phải ghi)
x = $\frac{1}{6}$ x $\frac{5}{2}$
x = $\frac{5}{12}$
Học tốt!!!
