题目内容
先化简再求值:(
-
)÷
,其中x=tan60°.
| 3x |
| x+1 |
| x |
| x-1 |
| x2-2x |
| x-1 |
原式=
•
=
•
=
,
当x=tan60°=
时,原式=
=
-1.
| 3x(x-1)-x(x+1) |
| (x+1)(x-1) |
| x-1 |
| x(x-2) |
=
| 2x(x-2) |
| (x+1)(x-1) |
| x-1 |
| x(x-2) |
=
| 2 |
| x+1 |
当x=tan60°=
| 3 |
| 2 | ||
|
| 3 |
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