题目内容
用简便方法计算. 8.8×0.125 |
7.6×5.3+3.7×7.6 | 0.8×0.02×12.5×5. |
分析:①8.8×0.125,将原式转化为:1.1×8×0.125,运用乘法结合律简算;
②7.6×5.3+3.7×7.6,运用乘法分配律简算;
③0.8×0.02×12.5×5,运用乘法交换律和结合律简算.
②7.6×5.3+3.7×7.6,运用乘法分配律简算;
③0.8×0.02×12.5×5,运用乘法交换律和结合律简算.
解答:解:①8.8×0.125
=1.1×(8×0.125)
=1.1×1
=1.1;
②7.6×5.3+3.7×7.6
=7.6×(5.3+3.7)
=7.6×9
=68.4;
③0.8×0.02×12.5×5
=(0.8×12.5)×(0.02×5)
=10×0.1
=1.
=1.1×(8×0.125)
=1.1×1
=1.1;
②7.6×5.3+3.7×7.6
=7.6×(5.3+3.7)
=7.6×9
=68.4;
③0.8×0.02×12.5×5
=(0.8×12.5)×(0.02×5)
=10×0.1
=1.
点评:此题考查的目的是理解掌握乘法的运算定律,并且能够灵活运用乘法的运算定律进行简便计算.
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