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5.6×0.8×1.25脱式计算

5.6×0.8×1.25脱式计算 解:采用分配律, 原式=5.6x(0.8x1.25) =5.6x1 =5.6

1.25x9.97x0.8 =1.25x0.8x9.97 =1x9.97 =9.97

4.2×(1.25乘以0.8) =4.2x(1.25x0.8) =4.2x1 =4.2

解:采用乘法交换律, 原式=1.25×0.96×0.8 =1.25×0.8×0.96 =1×0.96 =0.96

1.25x0.7x0.8 =1.25x0.8x0.7 =1x0.7 =0.7

39×1.25+ 0.8 =(40-1)x1.25+0.8 =40x1.25-1x1.25+0.8 =50-1.25+0.8 =50-1-0.25+0.8 =49+0.8-0.25 =49+0.55 =49.55 谢谢,请采纳

解:原式=1.25×0.8×0.32 =1×0.32 =0.32 望采纳

12.5×42×0.8 =(12.5×0.8)×42 =10×42 =420 3.8×5.6+4.4×3.8 =3.8×(5.6+4.4) =3.8×10 =38

2.5×3.2×1.25 =(2.5×0.4)×(8×1.25) =10×10 =100

(1)3.09×99+3.09=3.09×(99+1)=3.09×100=309;(2)0.125×0.25×4×0.8=(0.125×0.8)×(0.25×4)=0.1×1=0.1;(3)1.25×7+1.25=1.25×(7+1)=1.25×8=10;(4)1.25×101=1.25×(100+1)=1.25×100+1.25=125+1.25=126.25.

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