如图,已知点A(12,0),O为坐标原点,P是线段OA上任意一点(不含端点O,A),过P、O两点的二次函数y1和过P、A两点的二次函数y2的图象开口均向下,它们的顶点分别为B、C,射线OB与AC相交于点D.当OD=AD=8时,这两个二次函数的最大值之和等于( )
![](https://img.xkw.com/dksih/QBM/2022/4/8/2953804048400384/2956541785448448/STEM/17475cdc-9e7d-4d0c-a776-7c01293f8e96.png?resizew=207)
![](https://img.xkw.com/dksih/QBM/2022/4/8/2953804048400384/2956541785448448/STEM/17475cdc-9e7d-4d0c-a776-7c01293f8e96.png?resizew=207)
A.5 | B.2![]() | C.8 | D.6 |
2021·四川德阳·一模 查看更多[2]
更新时间:2022-04-12 13:22:34
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【推荐1】已知如图:抛物线
与
交于点
,分别交
轴于点
,
,过点
作
轴的平行线,分别交两条抛物线于点
,
.已知
,
,其中正确结论是( )
①
;②点
、
及
都在
上,则
;③
,则
;④
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/b5f64917-d19c-4db7-9533-2ff169aacfa3.png?resizew=217)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0cb27022a8a313ad17f4989e13fac1a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f68f688a0af020ed2aa105a1bcdb52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200f24e682c93e02a87f3f9d57dc5d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c1c6db119fa14ad0c91c70e97ea758f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522aaf0ebf09ca4dc15263bfcba39092.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab73f08c159d77c143c913f809f0777c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df86b0da538701c08fb214608e062372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a79d7f73b6128650bf7aed538260c72.png)
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A.②④ | B.①③ | C.②③ | D.③④ |
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【推荐2】已知抛物线
(
为任意实数)经过下图中两点M(1,-2)、N(
,0),其中M为抛物线的顶点,N为定点.下列结论:
①若方程
的两根为
,
(
),则
,
;
②当
时,函数值
随自变量
的减小而减小.
③
,
,
.
④垂直于
轴的直线与抛物线交于C、D两点,其C、D两点的横坐标分别为
、
,则
=2 .
其中正确的是( )
![](https://img.xkw.com/dksih/QBM/2018/1/23/1866683506040832/1867939441688576/STEM/835491e53acf404fab0a3fc7c6cebbfc.png?resizew=213)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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①若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e891fe1af408f7f790734d1070466365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/040135d64192de075ba0cc9f11ddbc9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa33c2bd791339d32821077846605d3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afcb05580a1b8f8bda3993ef313aa356.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0fa4ba23ab1698bf0ab318ecea6b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae018fde08edf0539089f98c17e11ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7992d077652ab674493d0836520fc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d0ce4e36a37c22267c03b54bd5ba3c.png)
④垂直于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/543858bd3739720da12206c84d097a4b.png)
其中正确的是( )
![](https://img.xkw.com/dksih/QBM/2018/1/23/1866683506040832/1867939441688576/STEM/835491e53acf404fab0a3fc7c6cebbfc.png?resizew=213)
A.①② | B.①④ | C.②③ | D.②④ |
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名校
【推荐1】如图,在等边
中,
,点E为高
上的一动点,以
为边作等边
,连接
、
,则
的最小值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/13/8a4a89e9-ef97-417a-9c4b-e56933288abe.png?resizew=133)
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【推荐2】如图,矩形ABCD中,
,以AB为直径作
,与CD相交于E,F两点,则图中阴影部分的面积是( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐1】如图,在
中,
,
是斜边
上的中线,过点D作
交
于点E,若
,
,则
的长为( )
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A.5 | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,
的对角线
与
相交于点O,
平分
,分别交
,
于点E,P,连接
,
,
,
,则下列结论:①
,②
,③
,④
,⑤
平分
,正确的结论有( )个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a58a622e2b1a239f2f96aa1501e9799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65639672f444b3d4dc6fc4f357ddbd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b77f1b9b728f39d0d9618504567eeb96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a790bfb51d2f553b7493ba8d8571740d.png)
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A.5 | B.4 | C.3 | D.2 |
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【推荐1】如图,在正方形ABCD中,AB=4,点P是AB上一动点(不与A、B重合),对角线AC、BD相交于点O,过点P分别作AC、BD的垂线,分别交AC、BD于点E、F,交AD、BC于点M、N.下列结论:①△APE≌△AME;②PE+PF=2
;③PE2+PF2=PO2;④△POF∽△BNF;⑤四边形OEPF的面积可以为3.其中正确的个数是( )
![](https://img.xkw.com/dksih/QBM/2021/7/7/2758895814524928/2761075646111744/STEM/825307dd29984466aec5f8bda10b8c23.png?resizew=186)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2021/7/7/2758895814524928/2761075646111744/STEM/825307dd29984466aec5f8bda10b8c23.png?resizew=186)
A.5 | B.4 | C.3 | D.2 |
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真题
【推荐2】如图,在矩形ABCD中,AB<BC,E为CD边的中点,将△ADE绕点E顺时针旋转180°,点D的对应点为C,点A的对应点为F,过点E作ME⊥AF交BC于点M,连接AM、BD交于点N,现有下列结论:
①AM=AD+MC;②AM=DE+BM;③DE2=AD•CM;④点N为△ABM的外心.其中正确的个数为( )
①AM=AD+MC;②AM=DE+BM;③DE2=AD•CM;④点N为△ABM的外心.其中正确的个数为( )
A.1个 | B.2个 | C.3个 | D.4个 |
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