题目内容

能简算的要用简便方法计算.
11
23
+
1
4
-
11
23
+
5
4

1-
4
27
-
3
27

4
5
-(
7
10
-
7
20

8
9
-(
1
7
+
2
9
(1)
11
23
+
1
4
-
11
23
+
5
4

=(
11
23
-
11
23
)+(
1
4
+
5
4
),
=0+
6
4

=
3
2


(2)1-
4
27
-
3
27

=1-(
4
27
+
3
27
),
=1-
7
27

=
20
27


(3)
4
5
-(
7
10
-
7
20
),
=
4
5
-
7
20

=
9
20


(4)
8
9
-(
1
7
+
2
9
),
=
8
9
-
1
7
-
2
9

=
8
9
-
2
9
-
1
7

=
2
3
-
1
7

=
11
21
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