题目内容
用简便方法计算. 404×25= |
25×125×4×8= |
8×137×125= | 17×36+17×64= |
分析:(1)把404看作400+4,运用乘法分配律简算;
(2)(3)运用乘法交换律与结合律简算;
(4)运用乘法分配律简算.
(2)(3)运用乘法交换律与结合律简算;
(4)运用乘法分配律简算.
解答:解:(1)404×25,
=(400+4)×25,
=400×25+4×25,
=10000+100,
=10100;
(2)25×125×4×8,
=(25×4)×(125×8),
=100000;
(3)8×137×125,
=8×125×137,
=1000×137,
=137000;
(4)17×36+17×64,
=(36+64)×17,
=1700.
=(400+4)×25,
=400×25+4×25,
=10000+100,
=10100;
(2)25×125×4×8,
=(25×4)×(125×8),
=100000;
(3)8×137×125,
=8×125×137,
=1000×137,
=137000;
(4)17×36+17×64,
=(36+64)×17,
=1700.
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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