выполнить действие:а) 3/4:5/6+2 1/2* 2/5-1:1 1/6; б) 2 3/4:(1 1/2-2/5)+(3/4+5/6):3 1/6; в)(2/15+7/12)*30/43-2:2 1/2*5/32; г)(3 1/2:4 2/3+4 2/3:3 1/2)*4 4/5; д)(11 5/11-8 21/22):1 2/3; е)((1 1/2)"'-3/4):7/8.
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