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12.5x0.64x2.5简便计算脱式计算

12.5x0.64x2.5 =(12.5x0.8)x(0.4x2.5x2) =10x2 =20

12.5x0.4x0.25x0.8用脱式计算 =(12.5x0.8)x(0.4x0.25) =10x0.1 =1

解: 16.5x0.25-12.5x0.25 ( 提取公因数)=(16.5-12.5)x0.25=4x0.25=1

12.5X(8+0.8) =12.5×8+12.5×0.8 =100+10 =110

109×100-5×100-400 =100×100+9×100-(500+400) =10000

16x7-7-5x7 =7×(16-1-5) =7×10 =70

4/5x4+2/5x2+1/5x16 =16/5+4/5+16/5 =36/5 =7.2

3.65x4.7-36.5x0.37 =36.5x0.47-36.5x0.37 =36.5x(0.47-0.37) =3.65 希望帮到了你,请采纳哦

29+ 5x105 +29脱式计算 =29*2+5*(100+5) =58+500+25 =500+58+25 =500+83 =583

5X7十1 =35+1 =36

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