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4分之1乘以7分之2能用简便算法就用简便算法脱式计算

原式 =1/4x2/7 =1/4x2x1/7 =1/2x1/7 =1/14

401-1/7-2/7-4/7 =401-(1/7+2/7+4/7) =401-1 =400

图 看图采纳啊

①12×38÷34=12×38×43=6;②49+59×9=49+5=549;③14÷(13+56)...

14/25÷7/10 =14/25×10/7 =4/5

3.6÷0.4-1.2×5=3。 简便计算过程如下: 3.6÷0.4-1.2×5 =1.2×3÷0....

2.5×0.32×125 =(2.5×0.4)×(0.8×125) =1×100 =100 ...

14.32×5.8-8.64×2.9 =14.32×2×2.9-8.64×2.9 =28.64×2....

(1)2005-395+605,=(2000+5)-(400-5)+(600+5),=(2000-4...

2/7+5/14+1/2,用脱式计算。 =4/14+5/14+7/14 =9/14+7/14 ...

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