题目内容
计算.
0.25×19+0.75×27 | (96.5-96.5×0.24-0.24)÷73.1. |
解:(1)0.25×19+0.75×27,
=0.25×19+0.25×81,
=0.25×(19+81),
=0.25×100,
=25;
(2)(96.5-96.5×0.24-0.24)÷73.1,
=(96.5-23.16-0.24)÷73.1,
=[96.5-(23.16+0.24)]÷73.1,
=[96.5-23.4]÷73.1,
=73.1÷73.1,
=1.
分析:(1)我们把0.75×27改写成0.25×81,然后运用乘法的分配律进行计算即可.
(2)我们按照小数的四则混合运算的顺序进行计算即可.
点评:本题运用乘法的分配律及小数的四则混合运算的顺序进行计算即可.
=0.25×19+0.25×81,
=0.25×(19+81),
=0.25×100,
=25;
(2)(96.5-96.5×0.24-0.24)÷73.1,
=(96.5-23.16-0.24)÷73.1,
=[96.5-(23.16+0.24)]÷73.1,
=[96.5-23.4]÷73.1,
=73.1÷73.1,
=1.
分析:(1)我们把0.75×27改写成0.25×81,然后运用乘法的分配律进行计算即可.
(2)我们按照小数的四则混合运算的顺序进行计算即可.
点评:本题运用乘法的分配律及小数的四则混合运算的顺序进行计算即可.
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