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脱式计算,能简算的要简算,需要过程

(1)3.58-2.36-(2.64-1.42)=3.58-2.36-2.64+1.42=(3.58+1.42)-(2.36+2.64)=5-5=0;(2)(14+16?13)×12=14×12+16×12-13×12=3+2-4=1;(3)3.6×118+8.4÷811=3.6×118+8.4×118=(3.6+8.4)×118=12×118=332;(4)34÷[3.75×(1.2?15)]=34÷[3.75×1...

125+125X79 =125X(1+79) =125X80 =10000 9000÷125÷8 =9000÷(125X8) =9000÷1000 =9

2/3, 1/72, 1, 17/30, 83, 6/5, 1/4, 3/7,

4.82-13.5+9.18 =4.82+9.18-13.5 =14-13.5 =0.5 =3.8*(15.6-5.6) =3.8*10 =38 =4÷2 =2 =15.4÷【0.8*17.5】 =15.4÷14 =1.1

(1)153÷45+6.6=3.4+6.6,、=10;(2)(14+18+112)×24=14×24+18×24+112×24,=6+3+2,=11;(3)3.6×[2÷(45?0.6)].=3.6×[2÷(0.8-0.6)],=3.6×[2÷0.2],=3.6×10,=36.

3.9×(8.2+1.8)×3.9 3.9×(2×10) 3.9×20 78

①2.5×1.25×32 =2.5×1.25×(4×8)=(2.5×4)×(1.25×8)=10×10=100 ②51×2443+51×1943=51×(2443+1943)=51×1=51③318÷58-159×127=258×85-149×97=5-2=3④0.65×201-0.65=0.65×(201-1)=0.65×200=130

答案是:119,1486,184,18,691,24

(1)1/2*2/5+9/10÷9/20 =1/5+9/10*20/9 =1/5+2 =2又1/5 (2)13/6÷4/5-1/6*5/4 =13/6×5/4-1/6×5/4 =5/4×(13/6-1/6) =5/4×2 =5/2

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