题目内容
脱式计算
92.5×0.25×4
6.7×0.9+6.7×0.1.
92.5×0.25×4
6.7×0.9+6.7×0.1.
分析:①92.5×0.25×4,运用乘法结合律简算;
②6.7×0.9+6.7×0.1,运用乘法分配律简算.
②6.7×0.9+6.7×0.1,运用乘法分配律简算.
解答:解:①92.5×0.25×4
=92.5×(0.25×4)
=92.5×1
=92.5;
②6.7×0.9+6.7×0.1
=6.7×(0.9+0.1)
=6.7×1
=6.7.
=92.5×(0.25×4)
=92.5×1
=92.5;
②6.7×0.9+6.7×0.1
=6.7×(0.9+0.1)
=6.7×1
=6.7.
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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