А $$\frac{3}{8} :6= \frac{3}{8*6} = \frac{3}{48}$$
б $$\frac{9}{10} :3= \frac{3}{10} =0.3$$
в $$\frac{9}{40} :3= \frac{3}{40}$$
г $$\frac{5}{12} :45= \frac{1}{108}$$
д $$\frac{1}{7} :7= \frac{1}{49}$$
е

А) 1/16
Б)3/10
В)3/160
Г)1/108
Д)1/49
Е)1/25