题目内容

计算.
4
7
-(
4
7
-
5
9
1
3
+
2
5
+
2
3
+
3
5
1
2
+(
1
3
-
1
5


1
3
-
1
4
+
1
12
5
12
+
3
4
-
3
8
11
12
+
4
5
+
1
12
(1)
4
7
-(
4
7
-
5
9

=
4
7
-
4
7
+
5
9

=
5
9


(2)
1
3
+
2
5
+
2
3
+
3
5

=(
1
3
+
2
3
)+(
2
5
+
3
5
),
=1+1,
=2;

(3)
1
2
+(
1
3
-
1
5

=
1
2
+
2
15

=
19
30


(4)
1
3
-
1
4
+
1
12

=
1
12
+
1
12

=
1
6


(5)
5
12
+
3
4
-
3
8

=
7
6
-
3
8

=
19
24


(6)
11
12
+
4
5
+
1
12

=(
11
12
+
1
12
)+
4
5

=1+
4
5

=1
4
5
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