Đáp án:
Giải thích các bước giải:
a) x : $\frac{3}{5}$ = $\frac{5}{9}$
x = $\frac{5}{9}$ : $\frac{3}{5}$
x = $\frac{5}{9}$ . $\frac{5}{3}$
x = $\frac{1}{3}$
b) x . $\frac{2}{3}$ = $\frac{4}{9}$
x = $\frac{4}{9}$ . $\frac{2}{3}$
x = $\frac{8}{27}$
c) $\frac{7}{8}$ . x = $\frac{7}{4}$
x = $\frac{7}{4}$ : $\frac{7}{8}$
x = $\frac{7}{4}$ . $\frac{8}{7}$
x = 2
d) $\frac{10}{3}$ : x = $\frac{1}{5}$
x = $\frac{10}{3}$ : $\frac{1}{5}$
x = $\frac{10}{3}$ . $\frac{1}{5}$
x = $\frac{2}{3}$
