Question

Срооооооочно
80 баллов​

Answer 1

$\displaystyle \tt a). \ \ \frac{3x}{5}=\frac{*}{15}\\\\{} \ \ \ \ \ \ *=\frac{3x\cdot15}{5}=9x;\\\\\\b). \ \ \frac{2ab}{3}=\frac{*}{3a^{2}b}\\\\{} \ \ \ \ \ \ *=\frac{2ab\cdot3a^{2}b}{3}=2a^{3}b^{2};\\\\\\c). \ \ \frac{-mn}{2m^{2}}=\frac{n}{*}\\\\{} \ \ \ \ \ \ *=\frac{2m^{2}n}{-mn}=-2m;$