题目内容
先将
÷
化简，然后自选一个合适的x值，代入化简后的式子求值．
| ||
| x-2 |
|
原式=
÷
=
•
=
•
•
=
取x=4时，原式=2．
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| x-2 |
| 1 | ||
|
| ||
| x-2 |
| x2-2x |
=
| ||
| x-2 |
| x |
| x-2 |
| x |
取x=4时，原式=2．
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| x-2 |
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| x-2 |
| 1 | ||
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| x-2 |
| x2-2x |
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| x-2 |
| x |
| x-2 |
| x |