题目内容
已知x2+3x-2=0,求代数式
÷(x-2)-
的值.
| x2-4x+4 |
| x+1 |
| x-1 |
| x+2 |
原式=
•
-
=
-
…(2分)
=
=-
,
∵x2+3x-2=0,
∴x2+3x=2,
∴原式=-
=-
.
| (x-2)2 |
| x+1 |
| 1 |
| x-2 |
| x-1 |
| x+2 |
=
| x-2 |
| x+1 |
| x-1 |
| x+2 |
=
| (x-2)(x+2)-(x+1)(x-1) |
| (x+1)(x+2) |
=-
| 3 |
| x2+3x+2 |
∵x2+3x-2=0,
∴x2+3x=2,
∴原式=-
| 3 |
| 2+2 |
| 3 |
| 4 |
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