题目内容

1-
7
10
=
1
6
+
4
6
=
3
9
+
4
9
=
1
8
+
1
8
=
7
8
-
5
8
=
2
5
+
3
5
=
1-
5
6
=
5
12
+
7
12
=
分析:根据分数加减法的计算方法进行计算.
解答:解:1-
7
10
=
3
10

1
6
+
4
6
=
5
6

3
9
+
4
9
=
7
9

1
8
+
1
8
=
1
4

7
8
-
5
8
=
1
4

2
5
+
3
5
=1
1-
5
6
=
1
6

5
12
+
7
12
=1
点评:考查了同分母分数加减法,分母不变,只把分子相加减.
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