题目内容
计算：
|
2
|
2
| ||||||||||||||
3
|
3
|
2
|
考点：分数的加法和减法
专题：运算顺序及法则
分析：同分母的分数相加、减，分母不变只把分子相加减即可，异分母分数相加，先通分化成同分母分数，然后按照同分母分数的加法的计算法则进行计算即可．
解答：
解：①
+
=
+
=
=2
②2
+
=2+（
+
）
=2+2
=4
③2
-1
=2
-1
=1
-1
=
④3
+11
=3
+11
=14
⑤3
+11
=3
+11
=14
⑥2
+
+1
=2
+
+1
=3
=5
| 6 |
| 5 |
| 5 |
| 6 |
=
| 36 |
| 30 |
| 25 |
| 30 |
=
| 61 |
| 30 |
=2
| 1 |
| 30 |
②2
| 7 |
| 9 |
| 11 |
| 9 |
=2+（
| 7 |
| 9 |
| 11 |
| 9 |
=2+2
=4
③2
| 1 |
| 12 |
| 1 |
| 4 |
=2
| 1 |
| 12 |
| 3 |
| 12 |
=1
| 13 |
| 12 |
| 3 |
| 12 |
=
| 5 |
| 6 |
④3
| 3 |
| 8 |
| 1 |
| 7 |
=3
| 21 |
| 56 |
| 8 |
| 56 |
=14
| 29 |
| 56 |
⑤3
| 3 |
| 8 |
| 1 |
| 7 |
=3
| 21 |
| 56 |
| 8 |
| 56 |
=14
| 29 |
| 56 |
⑥2
| 1 |
| 3 |
| 3 |
| 2 |
| 1 |
| 6 |
=2
| 2 |
| 6 |
| 9 |
| 6 |
| 1 |
| 6 |
=3
| 12 |
| 6 |
=5
点评：本题考查了同分母、异分母分数的计算法则进行计算．
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