题目内容
化简求值:
(1)
÷(4a2-b2),其中a=
,b=3;
(2)(
-
)÷
,其中x=3.
(1)
| 4a2-4ab+b2 |
| 2a-b |
| 1 |
| 2 |
(2)(
| x+2 |
| x2-2x |
| x-1 |
| x2-4x+4 |
| x-4 |
| x |
(1)原式=
•
=
,
把a=
,b=3代入得,原式=
;
(2)原式=[
-
]•
=
•
=
,
把x=3代入得,原式=1.
| (2a-b)2 |
| 2a-b |
| 1 |
| (2a+b)(2a-b) |
| 1 |
| 2a+b |
把a=
| 1 |
| 2 |
| 1 |
| 4 |
(2)原式=[
| x+2 |
| x(x-2) |
| x-1 |
| (x-2)2 |
| x |
| x-4 |
| x-4 |
| x(x-2)2 |
| x |
| x-4 |
| 1 |
| (x-2)2 |
把x=3代入得,原式=1.
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