题目内容

1
5
+
3
5
=
3
8
-
1
8
=
4
9
+
3
9
=
2
3
+
1
3
=
3
5
-
1
5
=
3
8
+
1
8
=
2
3
-
1
3
=
3
7
-
3
7
=
1
6
+
5
6
=
4
9
-
3
9
=
3
7
+
3
7
=
3
4
-
1
4
=
分析:根据同分母分数相加减法的计算方法:同分母分数相加减,分母不变,只把分子相加减即可.
解答:
解:
1
5
+
3
5
=
4
5
3
8
-
1
8
=
1
4
4
9
+
3
9
=
7
9
2
3
+
1
3
=1,
3
5
-
1
5
=
2
5
3
8
+
1
8
=
1
2
2
3
-
1
3
=
1
3
3
7
-
3
7
=0,
1
6
+
5
6
=1,
4
9
-
3
9
=
1
9
3
7
+
3
7
=
6
7
3
4
-
1
4
=
1
2
点评:此题主要考查的是同分母分数相加减的计算方法的灵活应用.
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