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o.25x4.8x0.5的简便计算

o.25x4.8x0.5 =0.25×4×1.2×0.5 =0.25×4×0.6×2×0.5 =1×0.6×1 =0.6

25.6一5.6x0.5简便计算 解: 25.6一5.6x0.5 =25.6-(6-0.4)x0.5 =25.6-6x0.5+0.4x0.5 =25.6-3+0.2 =22.8

4.82X4X0.5 =4.82×(4×0.5) =4.82×2 =9.64

0.25x4.8x0.5用简便法算 =0.25x4x1.2x0.5 =1x0.6 =0.6

4.8-4.8X0.5 =4.8x(1-0.5) =4.8x0.5 =2.4 祝天天向上。

5.2-5.2x0.5-0.5简便运算 =5.2x(1-0.5)-0.5 =5.2x0.5-0.5 =2.6-0.5 =2.1

4.8×0.25=(4+0.8)×0.25=4×0.25+0.8×0.25=1+0.2=1.2 0.78×98=0.78×(100-2)=0.78×100-0.78×2=78-1.56=76.44 0.5×2.33×8=(0.5×2)×4×2.33=1×4×2.33=9.32 1.5×105=1.5×(100+5)=1.5×100+1.5×5=150+7.5=157.5 0.3×2.5×0.4=(2.5×0.4 )×0.3=1×0...

解:采用结合律, 原式=0.8x0.25x0.4x12.5 =(0.8x12.5)x(0.25x0.4) =10x0.1 =1

解: 4.8-4.8×0.5 =4.8×(1-0.5) =4.8×05 =2.4

98x0.5 =(100-2)x0.5 =100x0.5-2x0.5 =50-1 =49

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