题目内容

1
7
+
5
7
=
4
5
-
1
5
=
4
9
+
3
9
=
4
8
-
3
8
=
1
7
+
6
7
=
2
3
-
2
3
=
1
10
+
9
10
=
1-
1
8
=
4
15
+
3
15
=
15
16
-
3
16
=
考点:分数的加法和减法
专题:运算顺序及法则
分析:同分母分数相加减,分母不变,分子相加减,由此求解.
解答: 解:
1
7
+
5
7
=
6
7
4
5
-
1
5
=
3
5
4
9
+
3
9
=
7
9
4
8
-
3
8
=
1
8
1
7
+
6
7
=1
2
3
-
2
3
=0
1
10
+
9
10
=1
1-
1
8
=
7
8
4
15
+
3
15
=
7
15
15
16
-
3
16
=
3
4
点评:本题考查了简单的分数加减法的计算,计算时要细心,注意把结果化成最简分数.
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