题目内容
0.25×16.2×4
3.6×102
3.72×3.5+6.28×3.5.
3.6×102
3.72×3.5+6.28×3.5.
分析:①0.25×16.2×4,运用乘法交换律简算;
②3.6×102,运用乘法分配律简算;
③3.72×3.5+6.28×3.5,运用乘法分配律简算.
②3.6×102,运用乘法分配律简算;
③3.72×3.5+6.28×3.5,运用乘法分配律简算.
解答:解:①0.25×16.2×4
=(0.25×4)×16.2
=1×16.2
=16.2;
②3.6×102
=3.6×100+3.6×2
=360+7.2
=367.2;
③3.72×3.5+6.28×3.5
=(3.72+6.28)×3.5
=10×3.5
=35.
=(0.25×4)×16.2
=1×16.2
=16.2;
②3.6×102
=3.6×100+3.6×2
=360+7.2
=367.2;
③3.72×3.5+6.28×3.5
=(3.72+6.28)×3.5
=10×3.5
=35.
点评:此题考查的目的是理解掌握乘法的运算定律,并且能够灵活运用这些运算定律进行简便计算.
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