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1,计算下面各题用(脱式计算) 1/6+1/3+1/2 8/15+...

1/6+1/3+1/2 =1/6+2/6+3/6 =1 8/15+(7/30-1/5) =16/30+7/30-6/30 =17/30 6/7-(1/7+1/2) =6/7-1/7-1/2 =12/14-2/14-7/14 =2/14 9/10-(1/4-1/6) =9/10-1/4+1/6 =54/60-15/60+10/60 =49/60

用简便方法计算下面各题: 3/9×8 +3/9×2 =3/9×(8+2) =1/3×10 =10/3 6/5×2/15+2/15×4/5 =2/15×(6/5+4/5) =2/15×2 =4/15 36×(1/3-5/18+7/12) =36×1/3-36×5/18+36×7/12 =12-10+21 =23

13/15 23/30 1/2 29/24 39/30 1/72

(1)7.8÷[32×(1-58)+3.6]=7.8÷[32×38+3.6]=7.8÷[12+3.6]=7.8÷15.6=0.5;(2)20513-2.73-8.27+1713=(20513+1713)-(2.73+8.27)=22-11=11;(3)15×(115+117)×17=15×115×17+15×117×17=17+15=32;(4)4.3×1.8+86×0.91=43×0.18+43×2×0.91=43...

3.89 21.71 23.7 197.01

13/15 315/234 简单麻烦

可以吗

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