精英家教网 > 小学数学 > 题目详情
(1)
2
7
×
3
8
×7
=
2
7
×7×
3
8

=2×
3
8

=
3
4

(2)
7
10
×9+
7
10

=
7
10
×(9+1)
=
7
10
×10
=7
分析:(1)根据乘法交换律进行简算;
(2)根据乘法分配律进行简算.
解答:解:
(1)
2
7
×
3
8
×7,
=
2
7
×7×
3
8

=2×
3
8

=
3
4


(2)
7
10
×9+
7
10

=
7
10
×(9+1),
=
7
10
×10,
=7.
故答案为:√,√.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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