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4.2x7.8+2.2x4.2脱式计算简便算法.

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你先回答我的问题,你是男是女

7.8-7.5+2.2-2.5=(7.8+2.2)-(7.5+2.5)=10-10=0

0.87x(3.36+4.64)

7.8×0.4+2.2÷5×2 =7.8x0.4+2.2x0.4 =(7.8+2.2)x0.4 =10x0.4 =4

9.83x(3.8-2.3)+ 1.5x6.17 =9.83×1.5+1.5×6.17 =1.5×(9.83+6.17) =1.5×16 =1.5×2×8 =3×8 =24

7.8+2.2x4 =7.8+8.8 =16.6

1. 0.4×125×25×0.8 =(0.4×25)×(125×0.8)=10×100=1000 2. 1.25×(8+10)=1.25×8+1.25×10 =10+12.5=22.5 3.9123-(123+8.8)=9123-123-8.8=9000-8.8=8991.2 4.1.24×8.3+8.3×1.76 =8.3×(1.24+1.76) =8.3×3=24.9 5.9999×1001=9999×(1000+1)=...

一、5.4÷1.8+240×1.5 =3+360 =363 二、9000÷72×(1.25×0.7×8) =9000÷72×7 =125×7 =875 三、61-(1.25+2.5×0.7) =61-3 =58 四、[(10-0.8)+9.85]-2÷0.125 =19.05-2÷0.125 =19.05-16 =3.05 1、脱式计算,即递等式计算,需将一系列的数字逐步计算。在...

1.25×0.8×3.37 =1×3.37 =3.37

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