如图是二次函数
的图象的一部分,对称轴是直线
,①
;②若
,
是抛物线上的两点,则
;③
;④
.上述4个判断中,正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520f445dad5a6c303bf75555ef44f4af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb24a82a4d77f52d0883adb665bd9117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b0ffac9bb8ac8c26a81e103995cdcc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da04f641c850a75a63031d5aed2e0625.png)
A.①②③ | B.①②④ | C.①③④ | D.①②③④ |
23-24九年级上·江苏南通·阶段练习 查看更多[2]
江苏省南通市海安市初中教学联盟2023-2024学年九年级上学期10月月考数学试题(已下线)专题02二次函数的图象和性质(7个知识点6种题型2个中考考点)-【帮课堂】2023-2024学年九年级数学下册同步学与练(苏科版)
更新时间:2023-11-01 09:12:57
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【推荐1】已知二次函数的图像y=ax²+bx+c(a≠0)如右图所示,下列结论⑴a+b+c=0 ⑵a-b+c﹥0 ⑶abc ﹥0 ⑷b=-2a其中正确的结论个数有( )
![](https://img.xkw.com/dksih/QBM/2018/10/8/2049043773931520/null/STEM/5a12663229214d13b489e914daa1fdfa.png?resizew=143)
![](https://img.xkw.com/dksih/QBM/2018/10/8/2049043773931520/null/STEM/5a12663229214d13b489e914daa1fdfa.png?resizew=143)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,抛物线
与
轴相交于点
,其对称轴为直线
,结合图象分析下列结论:
①
;②
;③当
时,
随
的增大而增大;④一元二次方程
的两根分别为
,
;⑤若
,
为方程
的两个根,则
且
.其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/8/cb1107ac-deb5-4d24-b5a3-702cd701eaf7.png?resizew=199)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da04f641c850a75a63031d5aed2e0625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e541ea2f855f981c96207070683d388.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7efb0a9db52206d5b40cc42eb8e65c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eba583e37243f3ba166bd1c11e58498.png)
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A.2个 | B.3个 | C.4个 | D.5个 |
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【推荐1】如图,抛物线
的顶点坐标为
,其大致图象如图所示,下列结论:①
;②
;③若方程
有两个根
,且
,则
;④若方程
有四个根,则这四个根的和为4.其中正确的结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca2d3ae5be4dab0306e7680f65b74e9.png)
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A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图为二次函数y=ax2+bx+c(a≠0)的图象,则下列说法:①abc>0;②2a+b=0;③a+b+c>0;④当﹣1<x<3时,y>0.其中正确的个数为( )
![](https://img.xkw.com/dksih/QBM/2020/9/4/2542454740475904/2543905890222080/STEM/92d20008-8452-414b-85d3-e4fa2f5158a8.png)
![](https://img.xkw.com/dksih/QBM/2020/9/4/2542454740475904/2543905890222080/STEM/92d20008-8452-414b-85d3-e4fa2f5158a8.png)
A.1 | B.2 | C.3 | D.4 |
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