题目内容

怎样算简便就怎样算.
5
14
+
7
18
+
9
14
1
4
+
7
8
-
5
8
3
4
-
5
12
-
1
12
4
15
+
5
9
+
11
15
+
1
9
13
14
-(
9
14
+
1
7
)
.
(1)
5
14
+
7
18
+
9
14

=
5
14
+
9
14
+
7
18

=1+
7
18

=1
7
18
;

(2)
1
4
+
7
8
-
5
8

=
1
4
+(
7
8
-
5
8
)
=
1
4
+
1
4

=
1
2
;

(3)
3
4
-
5
12
-
1
12

=
3
4
-(
5
12
+
1
12
)
=
3
4
-
1
2

=
1
4
;

(4)
4
15
+
5
9
+
11
15
+
1
9

=(
4
15
+
11
15
)+(
5
9
+
1
9
)
=1+
2
3

=1
2
3
;

(5)
13
14
-(
9
14
+
1
7
)

=
13
14
-
9
14
-
1
7

=
2
7
-
1
7

=
1
7
.
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