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4/5除以25的计算过程

4/5÷25=4/5×1/25=4/125

4/5*1/4 +0.25除以5/21-25%的简算 4/5×1/4+0.25÷5/21-25% =4/5×1/4+1/4÷5/21-1/4 =1/4×(4/5+21/5-1) =1/4×(5-1) =1/4×4 =1

2.4×(5.25÷25) =2.4×0.21 =0.504

4/5×2.5+12.5×4/25 =4/5×2.5+12.5/5×4/5 =4/5×(2.5+12.5/5) =4/5×(2.5+2.5) =4/5×5 =4 简便方法计算往往利用基本运算律:分配率、交换律和结合律。特别结合题目中的5、4等乘法为零的特点,可以使数学四则运算简单。

(8.25-3.75)÷2.5÷4 =4.5÷(2.5×4) =4.5÷10 =0.45

=(3/5+4/25x5/2)x1/3 =(3/5+2/5)×1/3 =1×1/3 =1/3

因题干条件不完整,缺必要条件,不能正常作答

(1/5+4)÷(1/2) =(0.2+4)x2 =2.4x2 =4.8。

4/5÷3 =4/5×1/3 =(4×1)/(5×3) =4/15 把除法转换成乘法 分子×分子/分母×分母

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