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9.82X12.5简便计算

9.82x12.5=12.5x(10-0.18)=125-12.5x0.18=125-12.5x(0.1+0.08)=125-(1.25+1)=125-2.25=122.75

0.8X72.4X12.5=0.8*12.5*72.4=10*72.4=724

9.92x12.5=(10-0.08)x12.5=10x12.5 -0.08x12.5=125 -1=124

0.8X72.4X12.5=(0.8X12.5)X72.4=10X72.4=724

7.92x12.5 =0.99X8X12.5 =0.99X(8X12.5) =0.99X100 =99

=(0.8-0.01)X12.5=0.8x12.5-0.01X12.5=10-0.125=9.875

6.4x0.25x12.5=8x0.8x0.25x12.5=(8x0.25)x(0.8x12.5)=2x10=20 解析:经过观察,此题可用乘法交换率,首先把算式中的6.4拆分成8x0.8,然后再将8和0.25相乘,0.8和12.5相乘,最后将这两组的积相乘,得出结果.这样就达到简便运算的目的.

0.8*72.4*12.5 =0.8*12.5*72.4 =10*72.4 =724 别忘采纳哦

0.72X12.5=0.8X0.9X12.5=(0.8X12.5)X0.9=10X0.9=9

3.2 X 12.5= 320 X 0.125= 40 X 8 X 1/8= 40

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