题目内容

7
8
+
5
12
=
2
5
-
2
7
=
4
15
+
2
3
=
7
12
+
4
5
=
1
5
6
+
7
9
=
2
3
8
-1
1
4
=
21
26
-
7
13
=
3
1
22
-
9
11
=
1
2
7
+2
3
14
=
3
8
×
4
5
=
7-4
4
7
=
4
9
×13
1
2
=
11
12
×4=
1
6
=
5
21
÷
10
7
=
15
4
=
6
5
÷8=
3
8
=
3
1
4
÷
4
13
=
3
5
÷
5
6
=
分析:按照分数四则运算的方法进行计算.
解答:
解:
7
8
+
5
12
=1
7
24
2
5
-
2
7
=
4
35
4
15
+
2
3
=
14
15
7
12
+
4
5
=1
23
60
1
5
6
+
7
9
=2
11
18
2
3
8
-1
1
4
=1
1
8
21
26
-
7
13
=
7
26
3
1
22
-
9
11
=2
5
22
1
2
7
+2
3
14
=3
1
2
3
8
×
4
5
=
3
10
7-4
4
7
=2
3
7
4
9
×13
1
2
=6,
11
12
×4=3
2
3
1
6
=1
1
3
5
21
÷
10
7
=
1
6
15
4
=
4
3
6
5
÷8=
3
20
3
8
=21
1
3
3
1
4
÷
4
13
=10
9
16
3
5
÷
5
6
=
18
25
故答案为:1
7
24
4
35
14
15
1
23
60
2
11
18
1
1
8
7
26
2
5
22
3
1
2
3
10
2
3
7
,6,3
2
3
1
1
3
1
6
4
3
3
20
21
1
3
10
9
16
18
25
点评:此题考查分数四则运算的计算方法,看准符号,灵活计算.
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