70 БАЛЛОВ!!
1) b:25/6=7/7:20/21
2)5 целых 3/5 : 3 целых 1/2=5 целых 1/4 : х
3)у : 3 целых 1/5 = 4 целых 1/2 :2 целых 1/4
4)х: 3/14= 31/9 : 4/9
5)х:4/5=3 целых 1/8 : 1 целая 1/4
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