А

3/7*1/2
2/3 :5/7
9/10 *1
2: 2/5
1/9: 1/3

Б
1/2*1/7
5/9*1
1/8:1/4
3:3/7
4/5×5


В

3/5*5/9
6/7*2/3
5/6:1/2
3/7:14
5/12:1/6

Желательно с решением
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