题目内容
计算:
(1)
•
(2)
÷
(3)
÷
(4)
÷
÷
.
(1)
| x-2 |
| 3-x |
| x2-6x+9 |
| x2-4 |
(2)
| 3x-6 |
| x2-4 |
| x+2 |
| x2+4x+4 |
(3)
| x2-2x+1 |
| x2-1 |
| x-1 |
| x2+x |
(4)
| a2-1 |
| a2+2a+1 |
| a2-a |
| a+1 |
| a2 |
| a+1 |
分析:将分子、分母分别因式分解,再将除法转化为乘法,然后再约分.
解答:(1)解:原式=
•
=-
;
(2)解:原式=
•
=3;
(3)解:原式=
•
=x;
(4)解:原式=
•
•
=
.
| x-2 |
| 3-x |
| (x-3)2 |
| (x-2)(x+2) |
=-
| x-3 |
| x-2 |
(2)解:原式=
| 3(x-2) |
| (x-2)(x+2) |
| (x+2)2 |
| (x+2) |
=3;
(3)解:原式=
| (x-1)2 |
| (x-1)(x+1) |
| x(x+1) |
| x-1 |
=x;
(4)解:原式=
| (a-1)(a+1) |
| (a+1)2 |
| a+1 |
| a(a-1) |
| a+1 |
| a2 |
=
| a+1 |
| a3 |
点评:本题考查了分式的乘除法,熟悉因式分解是解题的关键.
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