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.
用简便方法计算
(1)0.8÷1.25
(2)125.7×18.5-25.7×18.5.
(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.