题目内容
简便计算: 125×25×32 |
37×29+37 | 76×101 |
136×42-42×36 | 72×36+36×28. |
分析:(1)把32看作4×8,运用乘法交换律与结合律简算;
(2)(3)(4)运用乘法分配律简算.
(2)(3)(4)运用乘法分配律简算.
解答:解:(1)125×25×32,
=125×25×4×8,
=(125×8)×(25×4),
=1000×100,
=100000;
(2)37×29+37,
=37×(29+1),
=37×30,
=1110;
(3)76×101,
=76×(100+1),
=7600+76,
=7676;
(4)136×42-42×36,
=(136-36)×42,
=100×42,
=4200;
(5)72×36+36×28,
=(72+28)×36,
=100×36,
=3600.
=125×25×4×8,
=(125×8)×(25×4),
=1000×100,
=100000;
(2)37×29+37,
=37×(29+1),
=37×30,
=1110;
(3)76×101,
=76×(100+1),
=7600+76,
=7676;
(4)136×42-42×36,
=(136-36)×42,
=100×42,
=4200;
(5)72×36+36×28,
=(72+28)×36,
=100×36,
=3600.
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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