题目内容
化简:(
-
)•(x-3)的结果是( )
| 1 |
| x-3 |
| x+1 |
| x2-1 |
| A.2 | B.
| C.
| D.
|
(
-
)•(x-3)
=(
-
)•(x-3)
=
•(x-3)-
•(x-3)
=1-
=
.
故选B.
| 1 |
| x-3 |
| x+1 |
| x2-1 |
=(
| 1 |
| x-3 |
| 1 |
| x-1 |
=
| 1 |
| x-3 |
| 1 |
| x-1 |
=1-
| x-3 |
| x-1 |
=
| 2 |
| x-1 |
故选B.
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