题目内容

3
12
+
5
12
=
1-
3
9
=
2
3
+
1
3
=
1-
3
8
-
2
8
=
13
24
-
11
24
=
4
7
+
3
7
=
1-
1
2
=
1
9
+
2
9
+
3
9
=
6
8
-
4
8
=
7
9
-
2
9
=
5
6
-
1
6
=
1
3
+
1
3
+
1
3
=
考点:分数的加法和减法
专题:计算题
分析:根据同分母分数加减法的计算方法进行计算.
解答: 解:
3
12
+
5
12
=
2
3
1-
3
9
=
2
3
2
3
+
1
3
=1
1-
3
8
-
2
8
=
3
8
13
24
-
11
24
=
1
12
4
7
+
3
7
=1
1-
1
2
=
1
2
1
9
+
2
9
+
3
9
=
2
3
6
8
-
4
8
=
1
4
7
9
-
2
9
=
5
9
5
6
-
1
6
=
2
3
1
3
+
1
3
+
1
3
=1
点评:同分母分数想加减,分母不变,只把分子想加减.
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