问题 解答题

用简便方法计算

(1)0.8÷1.25

(2)125.7×18.5-25.7×18.5.

答案

(1)0.8÷1.25,

=(0.8×0.8)÷(0.8×1.25),

=0.64÷1,

=0.64;

(2)125.7×18.5-25.7×18.5,

=(125.7-25.7)×18.5,

=100×18.5,

=1850.

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