试题:
能简便计算的要简便计算.
6-
3
11
-
8
11

2
3
-
2
9
+
1
3

3
4
-(
2
5
-
1
4
10
9
+
1
3
-
1
9
7
16
+
9
20
+
9
16
+
11
20
11
14
-
3
5
+
3
14
-
2
5

答案:

我来补答
(1)6-
3
11
-
8
11

=6-(
3
11
+
8
11
),
=6-1,
=5;

(2)
2
3
-
2
9
+
1
3

=
2
3
+
1
3
-
2
9

=1-
2
9

=
7
9


(3)
3
4
-(
2
5
-
1
4
),
=
3
4
-
2
5
+
1
4

=
3
4
+
1
4
-
2
5

=1-
2
5

=
3
5


(4)
10
9
+
1
3
-
1
9

=
10
9
-
1
9
+
1
3

=1+
1
3

=1
1
3


(5)
7
16
+
9
20
+
9
16
+
11
20

=(
7
16
+
9
16
)+(
11
20
+
9
20
),
=1+1,
=2;

(6)
11
14
-
3
5
+
3
14
-
2
5

=(
11
14
+
3
14
)-(
2
5
+
3
5
),
=1-1,
=0.
 
 
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