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2.5x0.88简便计算

12.5*0.88=12.5*8*0.11=100*0.11=1112.5*0.88=12.5*2*4*0.11=25*4*0.11=100*0.11=11

原式=2.5x12+88x2.5=2.5x(12+88)=2.5x100=250 供参考.

2.5X12.9-2.5X0.9=2.5X(12.9-0.9)=2.5X12=2.5x4*3=10x3=30

=2.5*(10-0.2)=25-0.5=24.5

2.5x9.8=2.5x(10-0.2)=2.5x10-2.5x0.2=25-0.5=24.5

2.5x9.8 =(2+0.5)x9.8 =2x9.8+0.5x9.8 =19.6+4.9 =24.5

八万7905-388简便计算87905-388=87905-400+12=87505+12=87517

2.5x0.32x1.25=(2.5x0.4)x(0.8x1.25)=10x1=10

2.5*0.88=2.2

(2.5*0.2)*(8*0.125)=0.5*1=0.5

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