设二次函数
,
(m,n是实数,
)的最小值分别为p,q,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd2b4f019c0117513df8beabe15cacc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1661cae160650c765184d8cded2eb9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcba35b945865f4c52987ed739396acc.png)
A.若![]() ![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
2022·浙江杭州·二模 查看更多[2]
更新时间:2023-03-01 14:52:05
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【推荐1】方程x2-3x+2=0的最小一个根的倒数是( )
A.1 | B.2 C![]() |
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适中
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【推荐2】若方程(a-2)x2+(-2a+1)x+a=0有实数根,则 ( )
A.a≤-![]() | B.a≥-![]() | C.a≥-![]() | D.a>2 |
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【推荐1】如图,抛物线
的对称轴为直线
,与x轴的一个交点坐标为
,其部分图象如图所示,下列结论:①
;②
;③方程
的两个根是
,
;④
;⑤当
时,y随x增大而增大,其中结论正确的个数是( )
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A.5个 | B.4个 | C.3个 | D.2个 |
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【推荐2】二次函数y=x2+2x﹣3的图象的顶点坐标是( )
A.(﹣1,﹣4) | B.(1,﹣4) | C.(﹣1,﹣2) | D.(1,﹣2) |
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【推荐1】已知关于x的方程
的两个根分别是
,
,若
,
,
是二次函数
图象上的三点,则
,
,
的大小关系为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6863d4416bba7f0346eb83bb92060e8c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9314bd1d7a6e070f4f2428f9a321804e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知二次函数
图像的对称轴为直线
,部分图像如图所示,下列结论中:①
;②
;③
;④若t为任意实数,则有
;⑤当图像经过点
时,方程
的两根为
,则
,其中正确的结论有( )个.
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A.1 | B.2 | C.3 | D.4 |
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【推荐1】已知
,则函数
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c3c25e249dc58288abe2a5877babd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9071def6f2009c9cf10a52f1638d4b45.png)
A.有最小值![]() | B.有最小值![]() ![]() |
C.有最小值![]() ![]() | D.无最小值,也无最大值 |
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名校
【推荐2】已知二次函数
的图象与
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,
,下列说法中,①
;②该函数图象过定点
;③若该函数图象开口向下,则
的取值范围为
;
④当
,且
时,
的最大值为:
;⑤当
,且该函数图象与
轴两交点的横坐标
、
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,
时,
的取值范围为:
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④当
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