(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)根據(jù)乘法交換律進行簡算;
(2)根據(jù)乘法分配律進行簡算.
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.
故答案為:√,√.
點評:完成本題要注意分析式中數(shù)據(jù),運用合適的簡便方法計算.
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