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脱式计算(能简便算的要简算,写出主要步骤)①13.6...

(1)13.6-2.8+7.4-7.2=(13.6+7.4)-(2.8+7.2)=21-10=11;(2)817÷23+123×917+123=(817+917+1)×123=2×123=223;(3)(12+13)÷35-1718 =56÷35-1718 =2518-1718=49;(4)(14-0.1÷2)×513+1213=(14-0.05)×513+1213=15×513+1213=113+121...

2-6/13÷9/29-2/3 解:根据约分和通分的运用, 原式=2-6/13÷9/29-2/3 =2-6/13x29/9-2/3 =2-58/39-2/3 =2-1-19/39-26/39 =1-45/39 =-6/39 =-2/13

13.6+1.4÷(18.2-17.8)=13.6+1.4÷0.4=13.6+3.5=17.10.72÷[3.6×(0.51-0.49)]=0.72÷[3.6×0.02]=0.72÷0.072=10 10.01×12.6-12.6×0.01=126.126-0.126=12610.9×3.23-3.23=35.207-3.23=31.977

(1)13.6×3-40.6÷2,=40.8-20.3,=20.5;(2)99×0.75+14×99,=99×(0.75+0.25),=99×1,=99;(3)(56?58)×24,=56×24-58×24,=20-15,=5;(4)121×1001121,=121×(100+1121),=121×100+121×1121,=12100+1,=12101;(5)15÷3?7×(17+121)...

8/13*1/7+1/7*6/13=1/7(8/13+6/13)=2/13

(1)5.86+13.08-9.27,=18.94-9.27,=9.67;(2)25.4-(15.4-6.4),=25.4-15.4+6.4,=10+6.4,=16.4;(3)21+187÷17×11,=21+11×11,=21+121,=142;(4)115×6-6×5,=(115-5)×6,=110×6,=660;(5)(118-75)×(475÷25),=43×19,=817...

(1)13.6-(2.6+0.25÷25%)=13.6-(2.6+1),=13.6-3.6,=10;(2)1200÷〔56×(37-38)〕=1200÷(56×37-56×38),=1200÷(24-21),=1200÷3,=400;(3)(613×1.7+713×1.7)÷710 =(613+713)×1.7×107,=1×1.7×107,=177;(4)1375+450÷15×2...

13.6+1.4÷(18.2-17.8) =13.6+1.4÷0.4 =13.6+3.5 =17.1 0.72÷[3.6×(0.51-0.49)] =0.72÷[3.6×0.02] =0.72÷0.072 =10 10.01×12.6-12.6×0.01 =126.126-0.126 =126 10.9×3.23-3.23 =35.207-3.23 =31.977

①0.76×5.8+0.76×4.2=0.76×(5.8+4.2)=0.76×10=7.6②1.25×13.7×8=1.25×8×13.7=10×13.7=137③10-6.8-3.2=10-(6.8+3.2)=0④7.4×1.43+7.4×9.57-7.4=7.4×(1.43+9.57-1)=74

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