题目内容

下面各题怎样简便怎样算.
3
4
-(
5
6
-
1
2
)+
2
3
1
7
+
5
6
+
6
7
10
11
-(
1
4
-
1
11
)
4
7
+
6
7
-
3
4
-
1
4
2
3
-
1
6
+
1
3
2-
4
7
+
2
9
-
3
7
.
(1)
3
4
-(
5
6
-
1
2
)+
2
3
,
=
3
4
-
1
3
+
2
3
,
=
3
4
+(
2
3
-
1
3
),
=
3
4
+
1
3
,
=
13
12
;

(2)
1
7
+
5
6
+
6
7
,
=(
1
7
+
6
7
)+
5
6
,
=1+
5
6
,
=1
5
6
;

(3)
10
11
-(
1
4
-
1
11
),
=
10
11
-
1
4
+
1
11
,
=
10
11
+
1
11
-
1
4
,
=1-
1
4
,
=
3
4
;

(4)
4
7
+
6
7
-
1
4
-
3
4
,
=(
4
7
+
6
7
)-(
1
4
+
3
4
),
=
10
7
-1,
=
3
7
;

(5)
2
3
-
1
6
+
1
3
,
=(
2
3
+
1
3
)-
1
6
,
=1-
1
6
,
=
5
6
;

(6)2-
4
7
+
2
9
-
3
7
,
=(2+
2
9
)-(
4
7
+
3
7
),
=2
2
9
-1,
=1
2
9
.
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