题目内容

1
4
+
2
4
=
1-
7
8
=
4
7
-
2
7
=
1-
3
4
-
1
4
=
3
4
-
3
4
=
6
12
+
5
12
=
6
9
-
4
9
=
2
9
+
3
9
+
4
9
=
5
6
-
4
6
=
2
5
+
2
5
=
5
16
+
3
16
=
12
17
-
2
17
-
7
17
=
分析:同分母分数相加减,分母不变,分子相加减.
解答:解:
1
4
+
2
4
=
3
4
1-
7
8
=
1
8
4
7
-
2
7
=
2
7
1-
3
4
-
1
4
=0,
3
4
-
3
4
=0,
6
12
+
5
12
=
11
12
6
9
-
4
9
=
2
9
2
9
+
3
9
+
4
9
=1,
5
6
-
4
6
=
1
6
2
5
+
2
5
=
4
5
5
16
+
3
16
=
1
2
12
17
-
2
17
-
7
17
=
3
17
点评:本题考查了同分母分数相加减的计算方法,计算时要细心,做到快速、准确.
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