Question

99×5/8-0.625×68+1ⅹ5/8的简便计算？

Answer 1

解:提取5/8，0.625=5/8，然后按四则运算法则进行计算。计算过程

99ⅹ5/8-0.625ⅹ68+1ⅹ5/8
=5/8x(99-68+1)
=5/8ⅹ32
=20。

Answer 2

99×5/8-0.625×68+1×5/8
＝5/8×（99+1）-0.625×68
＝5/8×100-0.625×68
＝62.5-62.5×0.68
＝62.5×（1-0.68）
＝62.5×0.32
＝62.5×4×0.08
＝250×0.08
＝20