用简便方法计算下面各题.(1)2.9×0.45+0.29×4.2+0.029×13(2)3.84×9.6+0.96×61.6.

发布时间:2020-08-10 19:53:26

用简便方法计算下面各题.
(1)2.9×0.45+0.29×4.2+0.029×13
(2)3.84×9.6+0.96×61.6.

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解:
(1)2.9×0.45+0.29×4.2+0.029×13,
=2.9×0.45+2.9×0.42+2.9×0.13,
=2.9×(0.45+0.42+0.13),
=2.9×1,
=2.9;

(2)3.84×9.6+0.96×61.6,
=3.84×9.6+9.6×6.16,
=(3.84+6.16)×9.6,
=10×9.6,
=96.
解析分析:(1)根据乘法分配律进行计算;
(2)根据乘法分配律进行计算.

点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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