题目内容

计算.
7
9
+
5
6
-
2
3
3
4
-
5
8
+
5
12
3
5
-(
5
8
-
1
6
2
3
+(
1
4
+
3
8
9
13
-(
7
10
-
1
2
2
5
+(
5
6
-
2
3
分析:(1)(2)通分计算;
(3)(4)(5)(6)先算算括号内的,再算括号外的,注意通分计算.
解答:解:(1)
7
9
+
5
6
-
2
3

=
14
18
+
15
18
-
12
18

=
17
18


(2)
3
4
-
5
8
+
5
12

=
18
24
-
15
24
+
10
24

=
13
24


(3)
3
5
-(
5
8
-
1
6
),
=
3
5
-
11
24

=
17
120


(4)
2
3
+(
1
4
+
3
8
),
=
2
3
+
5
8

=
31
24


(5)
9
13
-(
7
10
-
1
2
),
=
9
13
-
1
5

=
32
65


(6)
2
5
+(
5
6
-
2
3
),
=
2
5
+
1
6

=
17
30
点评:解答此题,应注意运算顺序以及通分计算.
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