1)5/7*(21/20-7/30)+16/21:8/7= 2)4/45:(12/25-4/15)+15/16*4/15=
3)2:2 2/3+1 4/5*3 1/3-2 5/6=
4)3:3 3/4+2 2/5*2 1/2-3 5/6=
Желательно по действиям)Заранее спасибо
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