题目内容

脱式计算(能简算的要简算)
2
3
+
1
4
)+
3
4
          
1
2
-(
3
4
-
3
8
)          
1
4
+
1
3
+
1
4
+
2
3
5
7
+
1
4
-
9
14
            
3
4
+
3
6
-
5
8
              
9
7
+
1
8
+
3
8
+
5
7
8
9
-(
8
9
-
7
15
)         
3
4
+
3
7
-
3
4
              
4
9
+
8
9
-
8
15
①(
2
3
+
1
4
)+
3
4

=
2
3
+
1
4
+
3
4

=
2
3
+(
1
4
+
3
4
),
=1
2
3


1
2
-(
3
4
-
3
8
),
=
4
8
-
3
8

=
1
8



1
4
+
1
3
+
1
4
+
2
3

=
1
4
+
1
4
+(
1
3
+
2
3
),
=1.5;


5
7
+
1
4
-
9
14

=
20
28
+
7
28
-
18
28

=
9
29



3
4
+
3
6
-
5
8

=
18
24
+
12
24
-
15
24

=
5
8


9
7
+
1
8
+
3
8
+
5
7

=(
9
7
+
5
7
)+(
1
8
+
3
8
),
=2
1
2


8
9
-(
8
9
-
7
15
),
=
8
9
-
8
9
+
7
15

=
7
15


3
4
+
3
7
-
3
4

=
3
4
-
3
4
+
3
7

=
3
7


4
9
+
8
9
-
8
15

=
4
3
-
8
15

=
20
15
-
8
15

=
4
5
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