题目内容

计算下面各题.
3
10
+
1
6
-
2
5
7
8
-
1
2
+
3
4
1
2
+
3
5
-
7
10
1-(
3
4
-
2
5
)
1
3
+(
5
6
-
3
4
)
4
5
-(
1
6
+
3
10
)
(1)
3
10
+
1
6
-
2
5

=
9
30
+
5
30
-
12
30

=
2
30

=
1
15


(2)
7
8
-
1
2
+
3
4

=
7
8
-
4
8
+
6
8

=
9
8


(3)
1
2
+
3
5
-
7
10

=
5
10
+
6
10
-
7
10

=
4
10

=
2
5


(4)1-(
3
4
-
2
5

=1-(
15
20
-
8
20

=1-
7
20

=
13
20


(5)
1
3
+(
5
6
-
3
4

=
1
3
+(
10
12
-
9
12

=
4
12
+
1
12

=
5
12


(6)
4
5
-(
1
6
+
3
10

=
4
5
-(
5
30
+
9
30

=
24
30
-
14
30

=
10
30

=
1
3
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