题目内容
计算下列各题,得数化成最简分数.
|
|
|
1-
|
分析:第(1)(2)题属于同分母分数加减运算,只把分子相加减,分母不变;
第(3)(4)题属于异分母分数的加减运算,先通分,再按同分母分数的计算方法计算.
第(3)(4)题属于异分母分数的加减运算,先通分,再按同分母分数的计算方法计算.
解答:解:(1)
+
=
=
;
(2)
+
-
=
=
;
(3)
+
=
+
=
;
(4)1-
+
=
-
+
=
=
.
| 9 |
| 10 |
| 7 |
| 10 |
| 16 |
| 10 |
| 8 |
| 5 |
(2)
| 5 |
| 8 |
| 3 |
| 8 |
| 4 |
| 8 |
| 5+3-4 |
| 8 |
| 1 |
| 2 |
(3)
| 1 |
| 5 |
| 1 |
| 7 |
| 7 |
| 35 |
| 5 |
| 35 |
| 12 |
| 35 |
(4)1-
| 5 |
| 9 |
| 7 |
| 10 |
| 90 |
| 90 |
| 50 |
| 90 |
| 63 |
| 90 |
| 90-50+63 |
| 90 |
| 103 |
| 90 |
点评:此题主要考查同分母分数以及异分母分数的计算方法.
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