题目内容

看谁算得又对又快.
1
3
+
1
3
=
2
5
-
1
5
=
4
7
+
3
7
=
5
9
-
2
9
=
17
20
-
11
20
=
7
12
+
5
12
=
7
18
+
11
18
=
7
32
-
5
32
=
9
14
+
3
14
=
3
4
-
2
4
=
8
21
+
3
21
=
6
17
+
7
17
=
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
3
+
1
3
=
2
3
2
5
-
1
5
=
1
5
4
7
+
3
7
=1
5
9
-
2
9
=
1
3
17
20
-
11
20
=
3
10
7
12
+
5
12
=1
7
18
+
11
18
=1
7
32
-
5
32
=
1
16
9
14
+
3
14
=
6
7
3
4
-
2
4
=
1
4
8
21
+
3
21
=
11
21
6
17
+
7
17
=
13
17
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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