题目内容

递等式计算(能简算的要简算):
1
12
+
3
8
+(
5
8
+
5
12
)
8
9
-(
1
18
+
7
9
)
7
9
+
1
12
-
11
18
2
3
+
6
7
-
2
3
+
6
7
3-
17
26
+
15
26
1
2
-
11
15
+
1
2
-
4
15
.
(1)
1
12
+
3
8
+(
5
8
+
5
12
)
=(
1
12
+
5
12
)+(
3
8
+
5
8
),
=
1
2
+1,
=1
1
2
;

(2)
8
9
-(
1
18
+
7
9
)
=
8
9
-
7
9
-
1
18
,
=
1
9
-
1
18
,
=
1
18
;

(3)
7
9
+
1
12
-
11
18

=
31
36
-
11
18
,
=
1
4
;

(4)
2
3
+
6
7
-
2
3
+
6
7

=(
2
3
-
2
3
)+(
6
7
+
6
7
),
=0+
12
7
,
=
12
7
;

(5)3-
17
26
+
15
26

=3-(
17
26
-
15
26
),
=3-
2
26
,
=2
12
13
;

(6)
1
2
-
11
15
+
1
2
-
4
15

=(
1
2
+
1
2
)-(
11
15
+
4
15
),
=1-1,
=0.
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