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