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12.5/0.4+25/0.8的简便方法怎么做?

12.5/0.4+25/0.8的简便方法怎么做? 12.5/0.4+25/0.8 =25/0.8

(12.5 +2.5)×0.8×0.4 =15×0.8×0.4 =15×0.4×0.8 =6×

12.5X0.4+25X0.8 =0.4X(12.5+25X2) =0.4X62.5 =2/5

用简便方法计算 12.5*0.4*0.8 =12.5×0.8×0.4 =10×0.4 =4

(12.5-4)×0.8的简便计算? 运用乘法分配律使计算简便: (12.5-4)×0.8 =1

12.5×(8+0.8) =12.5×8+12.5×0.8 =100+10 =110 扩展资料 乘法

12.5×0.4×2.5×8 12.5×0.4×2.5×8 = (12.5×8)×(0.4×2.

12.5*0.8-0.125*0.8=10-0.1=9.9

利用乘法的交换律和结合律 0.8x0.25x0.4x12.5 =0.8x12.5x(0.25x0.4

先用12.5乘以8等于1000,再用1000乘以0.8等于800

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