Ответ:
20- 15 18/21= 20-333/21=20*21/21-333/21=420/21-333/21=87/21
31/35-3/7=31/35-15/35=16/35
2/7*3/5=5/35=1/7
4/9*15/24=5/18
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Ответ:
20- 15 18/21= 20-333/21=20*21/21-333/21=420/21-333/21=87/21
31/35-3/7=31/35-15/35=16/35
2/7*3/5=5/35=1/7
4/9*15/24=5/18