题目内容
化简分式计算:
÷
-
,并选择一个你认为合适的x的值,求代数式的值.
| x-3 |
| x2-1 |
| x2+x |
| x2+2x+1 |
| 1 |
| x-1 |
原式=
•
-
=
-
=
.
当x=2时,原式=
=
.
| x-3 |
| (x+1)(x-1) |
| (x+1)2 |
| x(x-3) |
| 1 |
| (x-1) |
=
| x+1 |
| x(x-1) |
| 1 |
| (x-1) |
=
| 1 |
| x(x-1) |
当x=2时,原式=
| 1 |
| 2(2-1) |
| 1 |
| 2 |
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