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5/15加2/5加1/2等于多少简算写计算过程.

5/15+2/5+1/2 = 5/15+2/5-1/2+1 = 10/30+12/30-15/30+1 = 1又7/30

4/15-(3/5-1/5)+2/5 =4/15-2/5+2/5 =4/15+(2/5-2/5) =4/15

1/6+2/5+1/2 =1/6+3/6+2/5 =2/3+2/5 =10/15+6/15 =16/15

1/5*1/2*(-15)+7*(-1/2) =(1/5*15+7)*(-1/2) =(3+7)*(-1/2) =10*(-1/2) =-5

5.5乘[1(2.2—2.15)]简便算 5.5乘[1(2.2—2.15)] =5.5*(1+0.85) =5.5*1.85 = 10.175

符号不好打出来,建议写在纸上,拍照上传

3/5-2/15-1/3 =7/15-1/3 =2/15

解:根据通分的运用: 原式=1/6+1/5+1/2 =5/30+6/30+15/30 =(5+6+15)/30 =26/30 =13/15

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