题目内容
化简求值:
-
,(x=2).
| 5x2+10x+5 |
| x2-1 |
| x2-x |
| x3-2x2+x |
原式=
-
=
-
=
,
当x=2时,原式=
=14.
| 5(x+1)2 |
| (x+1)(x-1) |
| x(x-1) |
| x(x-1)2 |
| 5(x+1) |
| x-1 |
| 1 |
| x-1 |
| 5x+4 |
| x-1 |
当x=2时,原式=
| 10+4 |
| 2-1 |
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