题目内容
化简求值:
÷
×
,其中x=4.
| 2x-6 |
| 4-4x+x2 |
| x+3 |
| x-2 |
| x2+6x+9 |
| 3-x |
原式=
×
•
=-
,
∵x=4,
∴原式=-
=-
=-7.
| 2(x-3) |
| (x-2)2 |
| x-2 |
| x+3 |
| (x+3)2 |
| 3-x |
=-
| 2(x+3) |
| x-2 |
∵x=4,
∴原式=-
| 2x+6 |
| x-2 |
| 2×4+6 |
| 4-2 |
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