题目内容

计算:
1
2
+
7
10
+
2
5
5
7
-(
1
8
+
3
7
1
7
+
1
6
+
6
7
+
5
6
3
4
+
5
6
-
7
8
11
9
-(
2
9
-
1
6
3-
7
9
-
2
9
+
1
4
(1)
1
2
+
7
10
+
2
5

=
5
10
+
7
10
+
4
10

=
8
5


(2)
5
7
-(
1
8
+
3
7

=
5
7
-
3
7
-
1
8

=
2
7
-
1
8

=
16
56
-
7
56

=
9
56


(3)
1
7
+
1
6
+
6
7
+
5
6

=(
1
7
+
6
7
)+(
1
6
+
5
6
),
=1+1,
=2;

(4)
3
4
+
5
6
-
7
8

=
18
24
+
20
24
-
21
24

=
17
24


(5)
11
9
-(
2
9
-
1
6

=
11
9
-
2
9
+
1
6

=1+
1
6

=1
1
6


(6)3-
7
9
-
2
9
+
1
4

=3-(
7
9
+
2
9
)+
1
4

=3-1+
1
4

=2+
1
4

=2
1
4
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