Giải bài 5 trang 16 toán 7 tập 1 chân trời sáng tạo.
a) x . $\frac{14}{27}$ = $-\frac{7}{9}$
x = $-\frac{7}{9}$ : $\frac{14}{27}$
x = $-\frac{3}{2}$
b) $(-\frac{5}{9})$ : x = $\frac{2}{3}$
x = $(-\frac{5}{9})$ : $\frac{2}{3}$
x = $-\frac{5}{6}$
c) $\frac{2}{5}$ : x = $\frac{1}{16}$ : 0,125
$\frac{2}{5}$ : x= $\frac{1}{2}$
x = $\frac{2}{5}$ : $\frac{1}{2}$
x = $\frac{4}{5}$
d) $-\frac{5}{12}$ . x = $\frac{2}{3}$ - $\frac{1}{2}$
$-\frac{5}{12}$ . x = $\frac{2}{3}$ - $\frac{1}{2}$
$-\frac{5}{12}$ . x = $\frac{1}{6}$
x = $\frac{1}{6}$ : $-\frac{5}{12}$
x = $-\frac{2}{5}$