题目内容

计算,能简算的要简算.
1
2
+
1
5
-
1
8

5
12
(
1
4
+
7
12
)

15
7
-
1
3
+
6
7

7
10
-(
1
3
+
1
4
)

6
7
-
1
6
-
3
10

13
12
-
1
4
+
11
24
-
3
4

(1)
1
2
+
1
5
-
1
8

=
7
10
-
1
8

=
23
40


(2)
5
12
+(
1
4
+
7
12
)

=(
5
12
+
7
12
)+
1
4

=1+
1
4

=1
1
4


(3)
15
7
-
1
3
+
6
7

=
15
7
+
6
7
-
1
3

=3-
1
3

=2
2
3


(4)
7
10
-(
1
3
+
1
4
)

=
7
10
-
7
12

=
7
60


(5)
6
7
-
1
6
-
3
10

=
29
42
-
3
10

=
41
105


(6)
13
12
-
1
4
+
11
24
-
3
4

=(
13
12
+
11
24
)-(
1
4
+
3
4
),
=
37
24
-1,
=
13
24
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