题目内容
脱式计算
104×0.25
0.47×0.5×0.8.
104×0.25
0.47×0.5×0.8.
分析:①104×0.25,转化为:(100+4)×0.25,运用乘法分配律简算;
②0.47×0.5×0.8,运用乘法结合律简算.
②0.47×0.5×0.8,运用乘法结合律简算.
解答:解:①104×0.25
=(100+4)×0.25
=100×0.25+4×0.25
=25+1
=26;
②0.47×0.5×0.8
=0.47×(0.5×0.8)
=0.47×0.4
=0.188.
=(100+4)×0.25
=100×0.25+4×0.25
=25+1
=26;
②0.47×0.5×0.8
=0.47×(0.5×0.8)
=0.47×0.4
=0.188.
点评:此题考查的目的是理解掌握乘法结合律、分配律,并且能够灵活运用乘法结合律、分配律进行简便计算.
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