a)Приведите дробь 2 /7 к знаменателю 14,21,35,140.
б)Приведите дроби 2/5,5/12,7/15,13/15 к знаменателю 60.
б)Приведите дроби 2/5,5/12,7/15,13/15 к знаменателю 60.
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2/7=4/14=6/21=10/35=40/1402/5=24/60
5/12=25/60
7/15=28/60
13/15=52/60