用简便方法计算(54+?)÷9?????9.25×9.9+92.5%?????????0.4×1.25×25×8.

发布时间:2020-07-31 05:44:32

用简便方法计算
(54+?)÷9?????
9.25×9.9+92.5%?????????
0.4×1.25×25×8.

网友回答

解:(1)(54+?)÷9,
=54÷9+÷9,
=6+×,
=6+,
=6;

(2)9.25×9.9+92.5%,
=9.25×9.9+9.25×0.1,
=(9.9+0.1)×9.25,
=10×9.25,
=92.5;

(3)0.4×1.25×25×8,
=(0.4×25)×(1.25×8),
=10×10,
=100.
解析分析:(1)先将根据乘法分配律计算;(2)先将92.5%化成小数0.925,0.925=9.25×0.1,再根据乘法分配律进行计算;(3)根据乘法结合律进行计算.

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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