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2.5乘1000乘1.25简算

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2.5乘1.6乘1.25=2.5x2x0.8x1.25=5x1=5不懂可追问,有帮助请采纳,谢谢!

解:采用凑整法,原式=2.5x1.25=2.5x4x1.25x8÷(4x8)=10x10÷32=100/32=25/8=3又1/8

2.5X0.64X1.25 =(2.5X0.8)X(0.8X1.25) =2X1=2

=2.5*0.875 +2.5*0.125=2.5*(0.875+0.125)=2.5*1=2.5

2.5*1.25*0.32=2.5*1.25*0.4*0.8=2.5*0.4*1.25*0.8=1*1=1

你好!2.5*1.25*0.32=2.5*1.25*(0.8*4)=(2.5*4)*(1.25*0.8)=10*1=10 仅代表个人观点,不喜勿喷,谢谢.

1.25*(8+0.4)=1.25*8+1.25*0.4=10+0.5=10.5

=2.5x4x0.8x1.25=10x1=10

0.5乘1.25乘2.5乘6.4乘7=0.5x1.25x2.5x2x4x0.8x7=(0.5x2)x(1.25x0.8)x(2.5x4)x7=1x1x10x7=70

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