Ответ:
1. 3/10=6/20
4/5=16/20
30/40=15/20
2.3/15=1/5
30/48=5/8
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Ответ:
1. 3/10=6/20
4/5=16/20
30/40=15/20
2.3/15=1/5
30/48=5/8