1. oblicz skracając tam, gdzie to możliwe
a 3/5x4/7
b 2/5:3/7
d 7/12:14/15
a)3/5x4/7=420/35=12
b)2/5:3/7=210/15=14
d)7/12:14/15=5
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a)3/5x4/7=420/35=12
b)2/5:3/7=210/15=14
d)7/12:14/15=5