题目内容

能简算的要简算
11
12
+
5
8
+
3
8
+
1
12
      

5-
3
7
-
4
7
       

3
4
-
5
12
+
1
6
5
6
-
1
4
+
1
3
23
28
+(
13
14
+
2
7
7-(
3
4
-
2
5
(1)
11
12
+
5
8
+
3
8
+
1
12

=(
11
12
+
1
12
)+(
5
8
+
3
8

=1+1
=2

(2)5-
3
7
-
4
7
 
=5-(
3
7
+
4
7

=5-1
=4

(3)
3
4
-
5
12
+
1
6

=
9
12
-
5
12
+
2
12

=
1
2


(4)
5
6
-
1
4
+
1
3

=
10
12
-
3
12
+
4
12

=
11
12


(5)
23
28
+(
13
14
+
2
7

=
23
28
+
17
14

=
57
28


(5)7-(
3
4
-
2
5

=7-
7
20

=6
13
20
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