题目内容

算一算.
8
9
-
2
9
=
5
7
+
2
7
=
2
6
+
3
6
=
1-
1
4
=
1
5
+
4
5
=
6
8
-
6
8
=
1
5
+
3
5
=
3
10
+
5
10
=
2
3
-
1
3
=
1-
7
8
=
3
4
-
1
4
=
1
2
+
1
2
=
考点:分数的加法和减法
专题:运算顺序及法则
分析:根据同分母分数加减法的计算方法进行计算.
解答: 解:
8
9
-
2
9
=
2
3
5
7
+
2
7
=1
2
6
+
3
6
=
5
6
1-
1
4
=
3
4
1
5
+
4
5
=1
6
8
-
6
8
=0
1
5
+
3
5
=
4
5
3
10
+
5
10
=
4
5
2
3
-
1
3
=
1
3
1-
7
8
=
1
8
3
4
-
1
4
=
1
2
1
2
+
1
2
=1
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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