题目内容
先通分,再加减.
(1)
+
+
.
(2)
-
-
(3)
+
-
.
(1)
| 1 |
| 3 |
| 1 |
| 8 |
| 1 |
| 24 |
(2)
| 27 |
| 28 |
| 3 |
| 4 |
| 1 |
| 7 |
(3)
| 1 |
| 2 |
| 3 |
| 5 |
| 7 |
| 10 |
考点:约分和通分,分数的加法和减法
专题:运算顺序及法则
分析:利用异分母分数加减法法则:先通分,再按照同分母分数的加减法计算即可.
解答:
解:(1)
+
+
=
+
+
=
=
;
(2)
-
-
=
-
-
=
=
;
(3)
+
-
=
+
-
=
=
.
| 1 |
| 3 |
| 1 |
| 8 |
| 1 |
| 24 |
=
| 8 |
| 24 |
| 3 |
| 24 |
| 1 |
| 24 |
=
| 12 |
| 24 |
=
| 1 |
| 2 |
(2)
| 27 |
| 28 |
| 3 |
| 4 |
| 1 |
| 7 |
=
| 27 |
| 28 |
| 21 |
| 28 |
| 4 |
| 28 |
=
| 2 |
| 28 |
=
| 1 |
| 14 |
(3)
| 1 |
| 2 |
| 3 |
| 5 |
| 7 |
| 10 |
=
| 5 |
| 10 |
| 6 |
| 10 |
| 7 |
| 10 |
=
| 4 |
| 10 |
=
| 2 |
| 5 |
点评:此题考查异分母分数的加减法计算方法,注意计算结果的化简.
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