题目内容
用所学规律算一算.
172×25×2×4 | (125+25)×4 | 13×102 | 73×102-2×73. |
解:(1)172×25×2×4,
=(172×2)×(25×4),
=344×100,
=34400;
(2)(125+25)×4,
=125×4+25×4,
=500+100,
=600;
(3)13×102,
=13×(100+2),
=1300+26,
=1326;
(4)73×102-2×73,
=73×(102-2),
=73×100,
=7300.
分析:(1)运用乘法交换律与结合律简算;
(2)运用乘法分配律简算;
(3)把102看作100+2,运用乘法分配律简算;
(4)运用乘法分配律简算.
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.
=(172×2)×(25×4),
=344×100,
=34400;
(2)(125+25)×4,
=125×4+25×4,
=500+100,
=600;
(3)13×102,
=13×(100+2),
=1300+26,
=1326;
(4)73×102-2×73,
=73×(102-2),
=73×100,
=7300.
分析:(1)运用乘法交换律与结合律简算;
(2)运用乘法分配律简算;
(3)把102看作100+2,运用乘法分配律简算;
(4)运用乘法分配律简算.
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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