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4.2x7.8+2.2x4.2脱式计算简便算法.

呃呃。。。

你先回答我的问题,你是男是女

4.2×(1.25乘以0.8) =4.2x(1.25x0.8) =4.2x1 =4.2

8×1.25×0.3×0.9=2.7 望采纳!

199×7加199×2加199用脱式计算 =199×(7+2+1) =199×10 =1990

47×102简便脱式计算怎么算 =47x(100+2) =47x100+47x2 =4700+94 =4794

7.8-7.5+2-2-2.5 =7.8-(7.5+2.5)+(2-2) =7.8-10 =-2.2

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)=...

7.8+2.2x4 =7.8+8.8 =16.6

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