题目内容
用你喜欢的方法计算.
①0.46×101 | ②1.25×0.25×3.2 | ③4.56×9+4.56 | ④100.1×101-100.1. |
解:①0.46×101,
=0.46×(100+1),
=46+0.46,
=46.46;
②1.25×0.25×3.2,
=1.25×0.25×0.8×4,
=(1.25×0.8)×(0.25×4),
=1×1,
=1;
③4.56×9+4.56,
=4.56×(9+1),
=4.56×10,
=45.6;
④100.1×101-100.1,
=100.1×(101-1),
=100.1×100,
=10010.
分析:①把101看作100+1,运用乘法分配律简算;
②把3.2看作0.8×4,运用乘法交换律与结合律简算;
③④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.
=0.46×(100+1),
=46+0.46,
=46.46;
②1.25×0.25×3.2,
=1.25×0.25×0.8×4,
=(1.25×0.8)×(0.25×4),
=1×1,
=1;
③4.56×9+4.56,
=4.56×(9+1),
=4.56×10,
=45.6;
④100.1×101-100.1,
=100.1×(101-1),
=100.1×100,
=10010.
分析:①把101看作100+1,运用乘法分配律简算;
②把3.2看作0.8×4,运用乘法交换律与结合律简算;
③④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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