题目内容
计算.
+
=
+
=
-
=
+
-
=
| 4 |
| 7 |
| 2 |
| 7 |
| 5 |
| 12 |
| 7 |
| 12 |
| 8 |
| 15 |
| 2 |
| 15 |
| 2 |
| 9 |
| 8 |
| 9 |
| 1 |
| 9 |
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:
+
=
;
+
=1;
-
=
;
+
-
=1.
| 4 |
| 7 |
| 2 |
| 7 |
| 6 |
| 7 |
| 5 |
| 12 |
| 7 |
| 12 |
| 8 |
| 15 |
| 2 |
| 15 |
| 2 |
| 5 |
| 2 |
| 9 |
| 8 |
| 9 |
| 1 |
| 9 |
点评:同分母分数相加减,分母不变,只把分子相加减,能约分的要化成最简分数.
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