若抛物线y=a
与直线y=3x+2交于点(1,b),则a+b的值为( )
![](https://img.xkw.com/dksih/QBM/2015/3/5/1573807705292800/1573807711322112/STEM/54c9bd2c5a1b47e489934ea67ed3e195.png)
A.10 | B.6 | C.-10 | D.-6 |
更新时间:2016-12-05 23:02:53
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【知识点】 y=ax²+bx+c的图象与性质解读
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适中
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【推荐1】已知二次函数
(
)与x轴的一个交点为
,其对称轴为直线
,其部分图象如图所示,有下列5个结论:①
;②
;③
;④
;⑤若关于x的方程
有两个实数根
,且满足
,则
,
.其中正确结论的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cfa2a6d9749a619edf80bad8b3e4962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77694c11ba40ec5c2fc4f6a05e31a048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9deb79d044a379f31a8fc57736d7ead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11e27b42a96427cdc800bf87b90f28c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0583be641ff02e7e7a82ee0413d1dc8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7962bd071b3df4a2a98c2be99f74350c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a40d7f543bc03518809f2c0037c9c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23cb5c1e146a4b724c2d9a1c013bd323.png)
A.5 | B.4 | C.3 | D.2 |
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适中
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【推荐2】二次函数y=ax2+bx+c(a≠0)的大致图象如图所示,顶点坐标为(﹣2,﹣9a),下列结论:①abc>0;②4a+2b+c>0;③9a﹣b+c=0;④若方程a(x+5)(x﹣1)=﹣1有两个根x1和x2,且x1<x2,则﹣5<x1<x2<1;⑤若方程|ax2+bx+c|=1有四个根,则这四个根的和为﹣8.其中正确的结论有( )个
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/cf4a4ea8-2ae6-4553-a67b-55ca6acce486.png?resizew=181)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/cf4a4ea8-2ae6-4553-a67b-55ca6acce486.png?resizew=181)
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