题目内容

(1)
5
6
-
4
6
=
(2)
9
14
-
3
14
=
(3)
17
30
-
8
30
=
(4)
29
72
-
16
72
=
(5)
90
300
-
40
300
=
(6)
8
25
-
6
25
=
(7)1-
8
65
-
9
65
-
10
65
=
(8)
(    )
36
-
10
36
=
11
36
(9)
10
100
-
(    )
100
=
3
100
分析:根据同分母分数加减法的计算方法进行计算.
解答:解:
(1)
5
6
-
4
6
=
1
6
(2)
9
14
-
3
14
=
3
7
(3)
17
30
-
8
30
=
3
10
(4)
29
72
-
16
72
=
13
72
(5)
90
300
-
40
300
=
1
6
(6)
8
25
-
6
25
=
2
25
(7)1-
8
65
-
9
65
-
10
65
=
38
65
(8)
21
36
-
10
36
=
11
36
(9)
10
100
-
7
100
=
3
100
点评:同分母分数相加减,分母不变,只把分子相加减.
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