问题 解答题
下面各题怎样算简便就怎样算.
3
14
×
1
3
+
2
3
×
3
14
×(
5
6
-
3
8

138×
7
137
答案

(1)

3
14
×
1
3
+
2
3
×
3
14
×(
5
6
-
3
8
),

=

3
14
×
1
3
+
2
3
×
3
14
×
11
24

=

3
14
×(
1
3
+
2
3
×
11
24
),

=

3
14
×(
1
3
+
11
36
),

=

3
14
×
23
36

=

23
168

(2)138×

7
137

=(137+1)×

7
137

=137×

7
137
+1×
7
137

=7+

7
137

=7

7
137

单项选择题
单项选择题