Выполните действия:1)9/20:0,09+3,61:1/5-18,63 2)(2 1/2-1,805):1,39+4:2,5 3)19,5:(3,5-1 11/20)-0,555:0,15 4)91*2/5:5,6+3,48:6/25*1,8
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