Задача №18367

$\frac{\boxed{}}{12}=\frac{3}{4}$$\frac{\boxed{}}{12}=\frac{3}{4}$$$\frac{\boxed{}}{12}=\frac{3}{4}$$

$\frac{2}{5}=\frac{\boxed{}}{35}$$\frac{2}{5}=\frac{\boxed{}}{35}$$$\frac{2}{5}=\frac{\boxed{}}{35}$$

$\frac{18}{\boxed{}}=\frac{3}{4}$$\frac{18}{\boxed{}}=\frac{3}{4}$$$\frac{18}{\boxed{}}=\frac{3}{4}$$

$\frac{5}{8}=\frac{40}{\boxed{}}$$\frac{5}{8}=\frac{40}{\boxed{}}$$$\frac{5}{8}=\frac{40}{\boxed{}}$$