二次函数二次函数
的图象如图所示.下列结论:
①
;②
;③
为任意实数、则
;④
;⑤若
且
,则
,其中正确结论的个数有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da68ff94b0877adb96abbc3e0fa52d86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f8f1b58ebcb6caea25fea71bfbccd1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a395a7795e783b4596bef9775d02ed6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add15431cd290a0d2059fcf403725ae7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33bd24e647a626899a243a3f3984f90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/419504736c4934f6e0df4114c3743944.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/29/d18e8351-37ed-46a6-9151-cefa17f86723.jpg?resizew=131)
A.1个 | B.2个 | C.3个 | D.4个 |
更新时间:2023-10-29 22:43:55
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【推荐1】如图,已知顶点为
的抛物线
经过点
,下列结论:①
;②
;③若点
在抛物线上,则
;④关于
的一元二次方程
的两根为5和
,其中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b8105f49853d809dd7975de89b314be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8374b5490fb6f8837a2e25cec1651ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/189b4cad020a6eb25a750a497f9491b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7579debfd0c425041b19140ba09f161c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7091d529281abff275ef19b9197445a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee2ad675768cb1d9c0a60ce73763fabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
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【推荐2】抛物线
(
为常数,
)经过点
,抛物线的对称轴为
,点
是抛物线上任意一点,有下列结论:①
;②
;③一元二次方程
的两个根为
和
;④若
,则
.其中正确结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448c0a5ee776d19ce8e42ac9a5fd27c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef00713e73b8357cc7900144f5505bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0079667537139336c46ed985f1af114c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75807858b7804a1ad2039c41f323a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e7ef804eeb23618fbf91ead47587f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90bf45f18d95ba729ad9e53f03c5d76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/602baac86c2b1668ecdfadc8a5948885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/031398bed2261809f175351c915efb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a448463430bf817d60644d2db127d8.png)
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【推荐1】如图,已知抛物线y=ax2+bx+c经过点(﹣1,0),对称轴是x=1,现有结论:①abc>0 ②9a﹣3b+c=0 ③b=﹣2a④(
﹣1)b+c<0,其中正确的有( )
![](https://img.xkw.com/dksih/QBM/2020/1/17/2378842703650816/2379877731532800/STEM/60a69552289347559512e19783bb1d06.png?resizew=161)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2020/1/17/2378842703650816/2379877731532800/STEM/60a69552289347559512e19783bb1d06.png?resizew=161)
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【推荐2】二次函数
(a,b,c为常数,且
),函数y与自变量x的部分对应值如表:
下列结论:①
;②二次函数的图象与x轴总有两个公共点;③若
,则二次函数图象顶点的纵坐标的最小值为3;④当自变量x的值满足
时,与其对应的函数值y随x的增大而增大,则
,其中所有正确结论的序号是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
x | … | ![]() | 1 | … |
y | … | ![]() | 3 | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6343069217cd6d8dd32446da428dae46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c8b1fb778919b87191a1e17a03bac4d.png)
A.①②③ | B.②③④ | C.①② | D.①③④ |
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【推荐1】已知二次函数
的图象如图所示,则下列结论:
①
同号;②当
和
时,函数值相等;③
;④当
时,
的值只能取0.其中正确的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/64a9048b-463a-460e-930c-574dda0afa7f.png?resizew=149)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983559377b0302733713116abb64d4f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15e8ebd1d7fc0e20a1de79ed02516e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd24f3c4bc9f9a75d4b28630bb630d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/64a9048b-463a-460e-930c-574dda0afa7f.png?resizew=149)
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【推荐2】如图,二次函数
的图像与
轴交于A、B两点,与
轴正半轴交于点C,且
,
,则下列结论:①
;②
;③
;④
,其中正确的结论是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/ce38e8d4-b9be-4cea-9ba0-ae66a8eaa62e.png?resizew=236)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a23f35ebcd9799d82c1e41c09781a4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef9bbbcd5b57c28916f0a737451d5051.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9deb79d044a379f31a8fc57736d7ead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143fb56f6f05c39fb5f52c7ecefdcb22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77b4d8d167ca5116fb2c5ba035919a1a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/ce38e8d4-b9be-4cea-9ba0-ae66a8eaa62e.png?resizew=236)
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【推荐1】已知k,n均为非负实数,且
,则代数式
的最小值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac6c27535255d310c3425f901e992407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4036b0d8a85df9f3aa064ead5a291c30.png)
A.-40 | B.16 | C.-8 | D.0 |
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【推荐2】如图,在平面直角坐标系中,已知
,
,
,
是线段
上的一个动点,连接
,过点
作
交
轴于点
.若点
,
在直线
上,则
的最大值是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/0ae3c1cd-6157-44fe-80c0-0aacf849cfd6.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101a4c1686c2179897654d958fd0b3f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ce8d4a9d432afe03a988ae2d49c28c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb004bd06fdddd447d6e32cbbcc7f9c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f715c8c8d0a67653d2a3e570259333d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/0ae3c1cd-6157-44fe-80c0-0aacf849cfd6.png?resizew=148)
A.![]() | B.![]() | C.![]() | D.![]() |
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