已知二次函数
的图象如图所示,现有下列结论:①
;②
;③
;④
;⑤
,则其中结论正确的个数是( )
![](https://img.xkw.com/dksih/QBM/2015/1/30/1573791015608320/1573791021154304/STEM/16a983bfc22f42468f1de9814be85e1b.png)
![](https://img.xkw.com/dksih/QBM/2015/1/30/1573791015608320/1573791021154304/STEM/33f486f326a5445d8160e208accbfdb6.png)
![](https://img.xkw.com/dksih/QBM/2015/1/30/1573791015608320/1573791021154304/STEM/3f601682d3f74dc2b115b2b9dbe09a4c.png)
![](https://img.xkw.com/dksih/QBM/2015/1/30/1573791015608320/1573791021154304/STEM/73411e08f4c3494d92db215449ae81bf.png)
![](https://img.xkw.com/dksih/QBM/2015/1/30/1573791015608320/1573791021154304/STEM/7c0312d4c0aa4e74b114f75eccb54c1f.png)
![](https://img.xkw.com/dksih/QBM/2015/1/30/1573791015608320/1573791021154304/STEM/93ab6ddec0c24263a0c14b0bf60bde34.png)
![](https://img.xkw.com/dksih/QBM/2015/1/30/1573791015608320/1573791021154304/STEM/f456eef553df47cc8c5841e4bf56a373.png)
![](https://img.xkw.com/dksih/QBM/2015/1/30/1573791015608320/1573791021154304/STEM/16a983bfc22f42468f1de9814be85e1b.png)
A.2 | B.3 | C.4 | D.5 |
更新时间:2016-12-05 22:28:56
|
【知识点】 根据二次函数的图象判断式子符号解读
相似题推荐
单选题
|
适中
(0.65)
【推荐1】如图,是二次函数
(a,b,c是常数,
)图象的部分,与x轴的交点A在点
和
之间,对称轴是直线
.对于下列说法:①
;②
;③
;④当
时,
;⑤
,其中正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/1/7/2631199858933760/2634300356435968/STEM/d408beb5-cd15-4d61-940c-817e10d3feea.png?resizew=195)
![](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/a812a9b58ccba331cfd21d244329af01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/623afc24f2227004b0e1b3922dfb954b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa285de4d015f208441ffe9a84bbd780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da04f641c850a75a63031d5aed2e0625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b843858ba23012c724dea0c51d54a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
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![](https://img.xkw.com/dksih/QBM/2021/1/7/2631199858933760/2634300356435968/STEM/d408beb5-cd15-4d61-940c-817e10d3feea.png?resizew=195)
A.①②④ | B.①②⑤ | C.②③④ | D.③④⑤ |
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单选题
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适中
(0.65)
【推荐2】已知二次函数 y=ax2+bx+c(a≠0),过(1,y1)(2,y2).
①若 y1>0 时,则 a+b+c>0
②若 a=b 时,则 y1<y2
③若 y1<0,y2>0,且 a+b<0,则 a>0
④若 b=2a﹣1,c=a﹣3,且 y1>0,则抛物线的顶点一定在第三象限上述四个判断正确的有( )个.
①若 y1>0 时,则 a+b+c>0
②若 a=b 时,则 y1<y2
③若 y1<0,y2>0,且 a+b<0,则 a>0
④若 b=2a﹣1,c=a﹣3,且 y1>0,则抛物线的顶点一定在第三象限上述四个判断正确的有( )个.
A.1 | B.2 | C.3 | D.4 |
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