已知两个多项式
,
,其中
为任意实数.有下列结论:
①若
,则
一定为正数;
②若
,则满足条件的
的值有4个;
③若
,则当
时,式子
取得最小值.
其中正确的结论个数有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01546ebed96f9bf32885108a0cd5877a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70541ec1c88805f490a505080f8fae20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d417bb42ad05a3f1d7720352be1a01f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa934581daabe793f049138397ef34b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5639098d9ff2fd77a43f5b207aea4b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c3e1b9fb2265b1cdd246a01ca3309d.png)
其中正确的结论个数有( )
A.0个 | B.1个 | C.2个 | D.3个 |
更新时间:2023-07-29 22:28:18
|
相似题推荐
单选题
|
较难
(0.4)
【推荐1】(’13安阳模拟)如图,二次函数
的图象与x轴交于点A、O,抛物线上有一点P,满足
,则点P的坐标是( )
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481607721754624/2483685317836800/STEM/c369cf2adec64ec58c76a89f3bdeadbe.png?resizew=86)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82dcc5fe6ac84505551dd26da0a8e52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec04ac025ce6e20a85ec31439cd6bc1.png)
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481607721754624/2483685317836800/STEM/c369cf2adec64ec58c76a89f3bdeadbe.png?resizew=86)
A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
单选题
|
较难
(0.4)
【推荐2】关于一次函数
,
,下列说法:
①函数
与
的图象关于y轴对称;
②若
,则此关于x的方程有且仅有两个相等的实数根;
③若函数
的图象过点
,则函数
的图象必过一、三象限.
其中正确的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/915b4637b59ba3b42dbc97e90d7a3778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74fa4f9e3490bb01392a6bcefc2db248.png)
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252261c6d4beda2ca6a089bb29717c9c.png)
③若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db043aef9328cd99423d99d4003cb733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18aed5d3f11f4ad1db64f67cd2716852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26099a8ef39042601297f7d296885cd.png)
其中正确的个数是( )
A.0 | B.1 | C.2 | D.3 |
您最近一年使用:0次
单选题
|
较难
(0.4)
【推荐1】将函数
的图象记为
.若一次函数
的图象与
有交点,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dfd3c185dcad8e8ec5d5aea6483d524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231896d2386c924306fce5ccf9f9e8a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
A.![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
单选题
|
较难
(0.4)
名校
【推荐2】已知直线
经过第一、二、三象限,且点
在该直线上,设
,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80991c1f0c963104740e50cfff6f29a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2755bb2da1b18b926cca94922c899a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较难
(0.4)
【推荐1】如图,在矩形
中,
点
是
的中点,点
是边
上的动点,连接
并延长交
的延长线于点
点
在五边形
中,连接
若
则四边形
面积的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed2e3dac199b2b4c14cd0fadbd63ed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d27546408b3fc40aed7d7d66e35e5561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2d87f879307e6ce228d27b0c96dcf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99da1432123a5fab778c279ccdc74282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139624d89661684695fee48ce2fbab77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5abaa8502d46c50c501394a9db348ba1.png)
A.![]() | B.![]() | C.41 | D.42 |
您最近一年使用:0次
单选题
|
较难
(0.4)
【推荐2】如图,直线l与⊙O相切于点A,M是⊙O上的一个动点,MH⊥l,垂足为H.若⊙O的半径为4,则MA―MH的最大值为( )
![](https://img.xkw.com/dksih/QBM/2022/3/22/2941564167192576/2964228772937728/STEM/b960580f-8e88-4f62-99e3-6605d51bee79.png?resizew=136)
![](https://img.xkw.com/dksih/QBM/2022/3/22/2941564167192576/2964228772937728/STEM/b960580f-8e88-4f62-99e3-6605d51bee79.png?resizew=136)
A.![]() | B.![]() | C.1 | D.2 |
您最近一年使用:0次