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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+ 1 4 ×99 ,=99×(0.75+0.25),=99×1,=99;(3) ( 5 6 - 5 8 )×24 ,= 5 6 ×24- 5 8 ×24,=20-15,=5;(4) 121×100 1 121 ,=121×(100+ 1 121 ),=121×100+121× 1 121 ,=12100+1...

3.08÷0.5÷2 =3.08÷(0.5x2) =3.08÷1 =3.08

(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...

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

(1)6.8×0.75÷0.5,=68×(0.75÷0.5),=68×1.5,=102;(2)13.5÷2.5-2.75,=5.4-2.75,=2.65;(3)0.125×0.25×32,=0.125×0.25×4×8,=(0.125×8)×(0.25×4),=1×1,=1;(4)0.9+9.9+99.9+0.3,=(1-0.1)+(10-0.1)+(100-0.1)+0.3,=1...

等下

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