Помогите: 3/4:9=? 2/5:10=? 11/15:22=? 4/7:2=?

Question

Помогите:
3/4:9=?
2/5:10=?
11/15:22=?
4/7:2=?

Answer 1

1) 3/4 :9 = 3/4 ·1/9 = 1/12
2) 2/5:10 = 2/5 ·1/10 = 1/25
3) 11/15 :22 = 11/15 · 1/22= 1/30
4) 4/7 : 2 = 4/7 · 1/2 = 2/7