题目内容

计算下面各题,能简算的要用简便方法计算.
4
5
-(
1
2
-
1
4
4
7
+
3
4
+
5
7
+
1
4
8
9
-(
1
6
+
1
3
3
8
-
2
11
+
5
8
-
7
11
5
6
-(
2
3
-
1
6
3
8
+
5
6
-
2
3
(1)
4
5
-(
1
2
-
1
4
),
=
4
5
-
1
4

=
11
20


(2)
4
7
+
3
4
+
5
7
+
1
4

=(
4
7
+
5
7
)+(
1
4
+
3
4
),
=
9
7
+1,
=2
2
7


(3)
8
9
-(
1
6
+
1
3
),
=
8
9
-
1
2

=
7
18


(4)
3
8
-
2
11
+
5
8
-
7
11

=(
3
8
+
5
8
)-(
2
11
+
7
11
),
=1-
9
11

=
2
11


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

=
1
3


(6)
3
8
+
5
6
-
2
3

=
3
8
+(
5
6
-
2
3
),
=
3
8
+
1
6

=
13
24
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