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
;

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


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


④
5
7
+
1
4
-
9
14
,
=
20
28
+
7
28
-
18
28
,
=
9
29
;


⑤
3
4
+
3
6
-
5
8
,
=
18
24
+
12
24
-
15
24
,
=
5
8
;

⑥
9
7
+
1
8
+
3
8
+
5
7
,
=(
9
7
+
5
7
)+(
1
8
+
3
8
),
=2
1
2
;

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

⑧
3
4
+
3
7
-
3
4
,
=
3
4
-
3
4
+
3
7
,
=
3
7
;

⑨
4
9
+
8
9
-
8
15
,
=
4
3
-
8
15
,
=
20
15
-
8
15
,
=
4
5
;
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