题目内容
计算:
(1)
+
-
;
(2)
+
-
.
(1)
| 2 |
| 3 |
| 3 |
| 2 |
| 5 |
| 6 |
(2)
| 19 |
| 32 |
| 3 |
| 16 |
| 5 |
| 8 |
分析:先通分,再根据同分母分数的加减法则计算即可求解.
解答:解:(1)
+
-
,
=
+1
-
,
=1
;
(2)
+
-
,
=
+
-
,
=
.
| 2 |
| 3 |
| 3 |
| 2 |
| 5 |
| 6 |
=
| 4 |
| 6 |
| 3 |
| 6 |
| 5 |
| 6 |
=1
| 1 |
| 3 |
(2)
| 19 |
| 32 |
| 3 |
| 16 |
| 5 |
| 8 |
=
| 19 |
| 32 |
| 6 |
| 32 |
| 20 |
| 32 |
=
| 5 |
| 32 |
点评:考查了分数的加法和减法,关键是通分变为同分母分数.
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