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25x2x4简便算法

25×19×4×2 =(25×4)×(19×2) =100×38 =3800 你好,本题已解答,如果满意 请点右下角“采纳答案”。

(30×25)×2×4 =(30×2)×(25×4) =60×100 =6000

45X25X2X4 =45*2*(25*4) =90*100 =9000

25x43x2x4 =(25x4)x(43x2) =100x86 =8600

25×35×4×2 =25×4×(35×2) =100×70 =7000

二十五乘以(四分之三+二分之一+四分之一)=二十五乘以二分之三=三分之七十七

简便算法25x(20x59)x4 =(20×59)×(4×25) =1180×100 =118 000

4.25X0.16+264X0.0425+5.2X4.25+0.425X20 =4.25x0.16+2.64x4.25+5.2x4.25+4.25x2 =4.25x(0.16+2.64+5.2+2) =4.25x10 =42.5

2.8x1.7x4.5=21.42 运用拆分法将2.8分为3-0.2,通过计算得: 2.8x1.7x4.5 =(3-0.2)x1.7x4.5 =3x1.7x4.5-0.2x1.7x4.5 =3x1.7x4.5-0.9x1.7 =1.7x0.9x(3x5-1) =1.7x0.9x14 =1.7x14x(1-0.1) =(2-0.3)x14x(1-0.1) =(28-4.2)x(1-0.1) =2...

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