1. 21/2:3/5= 4/5:2/7=
3/5:4/35=
14/5:7/2=
2.(17/26+11/13)*17/6=
в двух действиях
(5/22-8/11)*11/5=
в двух действиях
(1 3/11-13/22)*11/5=
в двух действиях
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