a) x.$\frac{3}{7}$ = $\frac{2}{3}$
x= $\frac{2}{3}$:$\frac{3}{7}$
x= $\frac{2}{3}$.$\frac{7}{3}=\frac{14}{9}$
b) x:$\frac{8}{11}$=$\frac{11}{3}$
x=$\frac{11}{3}$.$\frac{8}{11}$
x=$\frac{8}{3}$
c) $\frac{2}{5}$:x=$\frac{-1}{4}$
x=$\frac{2}{5}$:$\frac{-1}{4}$
x=$\frac{8}{-5}$
d)$\frac{4}{7}$.x-$\frac{2}{3}$=$\frac{1}{5}$
$\frac{4}{7}$.x= $\frac{1}{5}$+$\frac{2}{3}$=$\frac{13}{15}$
x= $\frac{13}{15}$:$\frac{4}{7}$
x= $\frac{91}{60}$
Chúc bạn học tốt
TEAM_IQ_ 2000
