题目内容
如果x-
=3,那么x2+
=( )
| 1 |
| x |
| 1 |
| x2 |
| A.5 | B.7 | C.9 | D.11 |
原式=x2+
+2-2,
=(x-
)2+2,
=9+2,
=11.
故选D.
| 1 |
| x2 |
=(x-
| 1 |
| x |
=9+2,
=11.
故选D.
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相关题目
如果x-
=3,那么x2+
=( )
| 1 |
| x |
| 1 |
| x2 |
| A、5 | B、7 | C、9 | D、11 |