抛物线
(
为常数,且
)的顶点坐标为
,其部分图象如图所示,以下结论错误 的是()
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39a50d5b4c97e1cb43e62553741622e.png)
A.![]() | B.![]() |
C.![]() | D.若![]() ![]() |
2024·陕西·一模 查看更多[1]
更新时间:2024-04-16 14:03:21
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【推荐1】已知二次函数y=-x2+2x+2,点A(x1,y1).B(x2,y2)(x1< x2)是其图象上两点,则下列结论正确的是( )
A.若x1+x2>2,则y1< y2 | B.若x1+x2< 2,则y1< y2 |
C.若x1+x2>-2则y1>y2 | D.若x1+x2<-2,则y1>y2 |
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真题
【推荐2】如图,二次函数
(
)的图象与
轴交于
,
两点,与
轴交 于点
,且
.则下列结论:( )
①
;
②
;
③
;
④
.
其中正确结论的个数是
![](https://img.xkw.com/dksih/QBM/2015/7/14/1573871970484224/1573871976701952/STEM/995d2bae07d94e5fa2aa2746c011f455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de648cd39338d48f2d22eb82a77b4839.png)
![](https://img.xkw.com/dksih/QBM/2015/7/14/1573871970484224/1573871976701952/STEM/84731bd1c73544aa81fa670511f25e2f.png)
![](https://img.xkw.com/dksih/QBM/2015/7/14/1573871970484224/1573871976701952/STEM/a3d8bde77578470c89efd47e41fa3353.png)
![](https://img.xkw.com/dksih/QBM/2015/7/14/1573871970484224/1573871976701952/STEM/1278602e58914be4a0e94c8de45a1b7d.png)
![](https://img.xkw.com/dksih/QBM/2015/7/14/1573871970484224/1573871976701952/STEM/3b102ecf58884856856b8f0cc8fe0ba1.png)
![](https://img.xkw.com/dksih/QBM/2015/7/14/1573871970484224/1573871976701952/STEM/17b3305b5591425c8304d5cc23739054.png)
![](https://img.xkw.com/dksih/QBM/2015/7/14/1573871970484224/1573871976701952/STEM/55f80c297bff4bdb8b16d7c87e66bb55.png)
①
![](https://img.xkw.com/dksih/QBM/2015/7/14/1573871970484224/1573871976701952/STEM/bc5e5a9ae8554b5d94c459011fcef1bb.png)
②
![](https://img.xkw.com/dksih/QBM/2015/7/14/1573871970484224/1573871976701952/STEM/d5dbbb9241654ded95b853c6623b0169.png)
③
![](https://img.xkw.com/dksih/QBM/2015/7/14/1573871970484224/1573871976701952/STEM/f47bf2e0339245a0959b8330adf4c767.png)
④
![](https://img.xkw.com/dksih/QBM/2015/7/14/1573871970484224/1573871976701952/STEM/f8a37984094d48b4997f4698d5f40076.png)
其中正确结论的个数是
![](https://img.xkw.com/dksih/QBM/2015/7/14/1573871970484224/1573871976701952/STEM/995d2bae07d94e5fa2aa2746c011f455.png)
A.4 | B.3 | C.2 | D.1 |
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名校
【推荐1】已知二次函数
的图象
如图所示,点
是坐标系的原点,点
是图象
对称轴上的点,图象
与
轴交于点
,则下面结论:
;
关于
的方程
的解是
,
;
当
时,
;
当
时,
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de7958890f35a4e42c700044a9c4c87.png)
周长的最小值是
.
正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/706965ec9cb9cda47b4cc0139b624aa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44a06fee94b6fbfce08a0670eee611d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/961b8e8e85881099c7fd630abe4b2654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754a5a4102094d0fc8a8c16c4fcd9bd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac12f90931435d60f4b6879ab26f7a0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9355031ea0b2dc9cef3777621bc6d38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d8b8edd94bc4d5d517ec77e56800e41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57458464618fcf619375a93d3c66d69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de7958890f35a4e42c700044a9c4c87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0904688a55710cef11cd394e90ec164b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc2ed9148021ee1465c3e497ea3b16b.png)
正确的有( )
A.2个 | B.3个 | C.4个 | D.5个 |
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【推荐2】如图,二次函数
的图像与x轴交于点
,对称轴是直线
,根据图像判断以下说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44ffc12c0f0e4be8074472571c9079cd.png)
A.![]() | B.![]() |
C.若![]() ![]() | D.当![]() |
您最近一年使用:0次