用配方法解方程
,配方后的方程是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f412bbbaf5f23aa588d67bf1260a9a7.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2021-03-20 11:46:23
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【知识点】 解一元二次方程——配方法解读
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【推荐2】对于示数x,规定
,例如
,
,现有下列结论:
①若
,则
;
②
的最小值为﹣1;
③对于实数a,b,若
,
,则
;
④
.
以上结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be315e528951120e7d551f654d2a1f5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e821bea3ae66e067736c7898bee5e54a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52da38cf025cb520b8e449946feff5cd.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e1a4f3d0f4f608ea4e8481843d19429.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
③对于实数a,b,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e85f9f35a4a7429ee7e40cea2bbea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f4d41c8e258f5e1932fbb334482eb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ce160d8bd97c6f6980bebab0659447.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7fad9a852f0dae65f39809b01b676.png)
以上结论正确的是( )
A.①② | B.②③ | C.③④ | D.②④ |
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