题目内容
若(x+
)2=
,试求(x-
)2的值为______.
| 1 |
| x |
| 25 |
| 4 |
| 1 |
| x |
∵(x+
)2=
,
∴x2+
=
-2=
,
∴(x-
)2=x2+
-2,
=
-2,
=
.
| 1 |
| x |
| 25 |
| 4 |
∴x2+
| 1 |
| x2 |
| 25 |
| 4 |
| 17 |
| 4 |
∴(x-
| 1 |
| x |
| 1 |
| x2 |
=
| 17 |
| 4 |
=
| 9 |
| 4 |
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有意义,则应满足的条件是( )
| x-1 |
| x-2 |
| A、x≠1 |
| B、x≠2 |
| C、x≠1且x≠2 |
| D、x≠1或x≠2 |