1/4 = 3/12 = 4/16 = 5/20 = 7/28 = (16,5)/66 = 0,25
?/66 может ?/60, тогда 15/60 = 0,25
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1/4 = 3/12 = 4/16 = 5/20 = 7/28 = (16,5)/66 = 0,25
?/66 может ?/60, тогда 15/60 = 0,25