659 вычислите до вечера

Объяснение:

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a) 1/3 = 2/6 = 3/9 = 4/12 = 5/15 = 6/18б) 1/4 = 3/12 = 4/16 = 5/20 = 7/28 = 15/60г) 4/5 = 8/10 = 12/15 = 20/25 = 60/75 = 80/100д) 5/6 = 10/12 = 25/30 = 30/36 = 50/60 = 55/66