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0.25x 16.5 40 简便计算

0.25x21.2x40 =0.25*40*21.2=10*21.2=212

0.25X1.5x40=(0.25x40)X1.5=10X1.5=15

12.5x0.25x0.8x40 =12.5x0.8x40x0.25 =1.25x8x40x1/4 =10x10 =100

0.25X9.2X40=0.25X9.2X10*4=0.25X4X9.2X10=1*92=92

0.25x0.76x40=0.25x40x0.76 =10x0.76=7.6

0.02x0.25x5x40=(0.02x5)x(0.25x40)=0.1*10=1

(0.25x12.5)x40=0.25x40x12.5=10x12.5=125

0.2539+0.25=0.25(39+1)=0.2540=10再看看别人怎么说的.

0.25*0.98*40=0.25*40*0.98=10*0.98=9.8

0.25x6.47x40=0.25x40x6.47=10x6.47=64.7

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