题目内容
将下列各式通分:
(1)
与
;
(2)
与
;
(3)
与
;
(4)
,
与
.
(1)
| 1 |
| 3ab |
| 1 |
| 9a2 |
(2)
| 1 |
| a2-3a |
| 1 |
| a2-9 |
(3)
| 1 |
| 2x-2 |
| 1 |
| (x-1)2 |
(4)
| 1 |
| (x-1)2 |
| 1 |
| x2-1 |
| 3 |
| (x-1)(x-2) |
分析:首先找出两个或三个分式的最简公分母是,再进一步根据分式的基本性质化为同分母分式即可.
解答:解:(1)
=
,
=
;
(2)
=
,
=
;
(3)
=
,
=
;
(4)
=
,
=
,
=
.
| 1 |
| 3ab |
| 3a |
| 9a2b |
| 1 |
| 9a2 |
| b |
| 9a2b |
(2)
| 1 |
| a2-3a |
| a+3 |
| a(a+3)(a-3) |
| 1 |
| a2-9 |
| a |
| a(a+3)(a-3) |
(3)
| 1 |
| 2x-2 |
| x-1 |
| 2(x-1)2 |
| 1 |
| (x-1)2 |
| 2 |
| 2(x-1)2 |
(4)
| 1 |
| (x-1)2 |
| (x+1)(x-2) |
| (x-1)2(x+1)(x-2) |
| 1 |
| x2-1 |
| (x-1)(x-2) |
| (x-1)2(x+1)(x-2) |
| 3 |
| (x-1)(x-2) |
| 3(x+1)(x-1) |
| (x-1)2(x+1)(x-2) |
点评:此题主要考查分式的通分,关键是找出最简公分母.
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