1) 31/60+(7/20+11/60)=1целая 1/20
2) 53/54-(1/6+7/9)=1/27
3)13/35+(23/35-2/7)=26/35
4)7/16-(3/4-5/16)=0
Вот
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1) 31/60+(7/20+11/60)=1целая 1/20
2) 53/54-(1/6+7/9)=1/27
3)13/35+(23/35-2/7)=26/35
4)7/16-(3/4-5/16)=0
Вот