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