题目内容
当x=1时,代数式
÷(x+
)的值是( )
| x2-3x |
| x-2 |
| 3 |
| 2-x |
A.
| B.3 | C.2 | D.4 |
原式=
•
=
•
=
,
当x=1时,
=
.
故选A.
| x(x-3) |
| x-2 |
| 2-x |
| 2x-x2+3 |
| x(x-3) |
| x-2 |
| x-2 |
| (x-3)(x+1) |
| x |
| x+1 |
当x=1时,
| x |
| x+1 |
| 1 |
| 2 |
故选A.
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