题目内容
脱式计算
3.4×8.7+34×0.13
6.5×1.1.
3.4×8.7+34×0.13
6.5×1.1.
分析:①3.4×8.7+34×0.13,转化为:3.4×8.7+3.4×1.3,运用乘法分配律简算;
②6.5×1.1,转化为:6.5×(1+0.1),运用乘法分配律简算.
②6.5×1.1,转化为:6.5×(1+0.1),运用乘法分配律简算.
解答:解:①3.4×8.7+34×0.13
=3.4×8.7+3.4×1.3
=3.4×(8.7+1.3)
=3.4×10
=34;
②6.5×1.1
=6.5×(1+0.1)
=6.5×1+6.5×0.1
=6.5+0.65
=7.15.
=3.4×8.7+3.4×1.3
=3.4×(8.7+1.3)
=3.4×10
=34;
②6.5×1.1
=6.5×(1+0.1)
=6.5×1+6.5×0.1
=6.5+0.65
=7.15.
点评:此题考查的目的是理解掌握乘法分配律,并且能够灵活运用乘法分配律进行简便计算.
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