问题 填空题
计算:(
23
5
×
31
7
+
25
7
×
23
5
1
8
=______.
答案

(

23
5
×
31
7
+
25
7
×
23
5
1
8

=[

23
5
×(
31
7
+
25
7
)]×
1
8

=[

23
5
×8]×
1
8

=

23
5
×(8×
1
8
),

=

23
5
×1,

=

23
5

故答案为:

23
5

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