题目内容
简便计算.
576+38+162+124 | 125×56 | 99×87+87 | 96×27+27×4. |
解:(1)576+38+162+124,
=(576+124)+(38+162),
=700+200,
=900;
(2)125×56,
=125×8×7,
=1000×7,
=7000;
(3)99×87+87,
=(99+1)×87,
=100×87,
=8700;
(4)96×27+27×4,
=(96+4)×27,
=100×27,
=2700.
分析:(1)运用加法交换律与结合律简算;
(2)把56看作8×7,运用乘法结合律简算;
(3)(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.
=(576+124)+(38+162),
=700+200,
=900;
(2)125×56,
=125×8×7,
=1000×7,
=7000;
(3)99×87+87,
=(99+1)×87,
=100×87,
=8700;
(4)96×27+27×4,
=(96+4)×27,
=100×27,
=2700.
分析:(1)运用加法交换律与结合律简算;
(2)把56看作8×7,运用乘法结合律简算;
(3)(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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