题目内容
计算下面各题,把得数约成最简分数.
-
=
+
=
-
=
-
=
+
=
+
=
2 |
3 |
1 |
3 |
2 |
10 |
4 |
10 |
8 |
9 |
2 |
9 |
12 |
15 |
3 |
15 |
13 |
7 |
15 |
7 |
9 |
20 |
3 |
20 |
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,分子相加减即可求解.
解答:
解:
-
=
+
=
-
=
-
=
+
=4
+
=
2 |
3 |
1 |
3 |
1 |
3 |
2 |
10 |
4 |
10 |
3 |
5 |
8 |
9 |
2 |
9 |
2 |
3 |
12 |
15 |
3 |
15 |
3 |
5 |
13 |
7 |
15 |
7 |
9 |
20 |
3 |
20 |
3 |
5 |
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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