平面直角坐标系中,二次函数
的图象如图所示,现给出下列结论:①
;②
;③
;④
(
为实数);⑤
.其中正确的结论的个数是( )
![](https://img.xkw.com/dksih/QBM/2020/8/4/2520636736995328/2520709171830784/STEM/a3f1f4ef-727b-4fdb-ad57-46d817ce9ae3.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3fe5e88023c71ab59beeb69fc722e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/540a408fa8e480416855df9647c27203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a0db70be7145f74c092d6561d447e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e0c865c1f8d424665e0f756aa600ff1.png)
![](https://img.xkw.com/dksih/QBM/2020/8/4/2520636736995328/2520709171830784/STEM/a3f1f4ef-727b-4fdb-ad57-46d817ce9ae3.png?resizew=148)
A.2 | B.3 | C.4 | D.5 |
更新时间:2020-08-28 19:58:40
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【推荐1】如图是二次函数
图象的一部分,对称轴是直线
,下列判断:①
;②
;③
;④
;⑤若自变量x的取值范围是
.则函数值
.其中正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/c5c4ed88-ef95-4b8b-9bcf-f639a37dd777.png?resizew=126)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365d218f0abd54e1184983e0fe4367c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a395a7795e783b4596bef9775d02ed6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/723198c69ee8cfe941dd2df107dabf8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f2333e2a05532b97e14b912e331ec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/c5c4ed88-ef95-4b8b-9bcf-f639a37dd777.png?resizew=126)
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【推荐2】二次函数
的图象如图所示.下列说法中不正确的是【 】
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/361000c5-c09f-4200-9480-c26dd53d14cf.png?resizew=125)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a153cf1199bb4bf93b6e80ac3f67bdbd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/361000c5-c09f-4200-9480-c26dd53d14cf.png?resizew=125)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】已知二次函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
,
,
都是常数,且
的图象与
轴交于点
,
、![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
,
,且
,与
轴的正半轴的交点在
,
的下方,下列结论:①
;②
;③
;④
;⑤
是常数
.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/c39e7328deebc1c72333d47961ad58b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bcdced8d8610b8f00069e4f9a5f9196.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526d1ee3cc2e405477264c9cc4d03b2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1158b401ca717391b6474d457721a6fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1158b401ca717391b6474d457721a6fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de1be6798f6f5497315b6a746acbfd34.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9e8a8636cfbb1bf317c98bc61938c63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a42cb804ec493439e3cd679d98b27cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75b94841c322703997b6611c7b92bc55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f680c0fe661037e71624c5262f7a187.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a0db70be7145f74c092d6561d447e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1412203145cf5d02c374310cf44349e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
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【推荐2】如图,二次函数
的图象与
轴交于
两点,与
轴负半轴交于点
,它的对称轴为直线
,则下列选项中正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/1/25/2645756292767744/2666357481906176/STEM/3a6a367f-63df-4983-8a32-a286ed4cc4ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.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/b650820d7bed48ed67a2869ad8c65ff1.png)
![](https://img.xkw.com/dksih/QBM/2021/1/25/2645756292767744/2666357481906176/STEM/3a6a367f-63df-4983-8a32-a286ed4cc4ea.png)
A.![]() | B.![]() |
C.![]() | D.当![]() ![]() |
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【推荐1】已知:二次函数y=ax2+bx+c(a≠0)的图象如图所示,下列结论中:①abc>0;②b+2a=0;③a-b<m(am+b)(m≠-1);④ax2+bx+c=0两根分别为-3,1;⑤4a+2b+c>0.其中正确的项有( )
![](https://img.xkw.com/dksih/QBM/2018/12/19/2100076568879104/2101685158854656/STEM/6395a6f7a6554dac81362e4527b78135.png?resizew=159)
![](https://img.xkw.com/dksih/QBM/2018/12/19/2100076568879104/2101685158854656/STEM/6395a6f7a6554dac81362e4527b78135.png?resizew=159)
A.2个 | B.3个 | C.4个 | D.5个 |
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【推荐2】如图,抛物线
与x轴交于A,B两点,与y轴交于点
.已知点A在
与
之间(不包含这两点),抛物线的顶点为D,对称轴是直线
.下列结论中正确的个数是( )
; ②
; ③
;
④若三点
,
,
均在函数图象上,则
;
⑤若
,则
是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b64196fcc78c3d4e076339b262ad91dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd0825e68122a65426840fbf07cf296.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcbcd0aebdd8bd688d108834747009f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77694c11ba40ec5c2fc4f6a05e31a048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fae5482be5d6e9ee30b81f91607c81d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a59304afb71c98f3480278733eab4249.png)
④若三点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccbc02110922dc91aab0d325b62bb57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbdc6e14577fbcc8fd26ad13faff3c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/591d7e78f8563a8495741ebed0552ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f1fa86e984f7cee0b875b17531052b.png)
⑤若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
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名校
【推荐1】如图,抛物线
与x轴交于点
,其对称轴为直线
,结合图象分析下列结论:①
;②当
时,y随x的增大而增大;③
;④
;⑤若m,n(
)为方程
的两个根,则
且
.其中正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/2021/12/8/2868131822919680/2869661721649152/STEM/481af8b0-60a7-4ac1-b18b-6fe46a57b76e.png?resizew=230)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcbcd0aebdd8bd688d108834747009f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c98a7f3a8bf384b1dfc1d34aebd46d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e541ea2f855f981c96207070683d388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f37c00b68562869a231e5bc3702735bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da04f641c850a75a63031d5aed2e0625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb7961cbe98aac6a5fdee94582c341b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e197a1536020b3ed8a342479c409268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60994f80d3ced53fc18ddd7e3d659aad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9153fb853cd99beec9e600a4eaf73fe8.png)
![](https://img.xkw.com/dksih/QBM/2021/12/8/2868131822919680/2869661721649152/STEM/481af8b0-60a7-4ac1-b18b-6fe46a57b76e.png?resizew=230)
A.2个 | B.3个 | C.4个 | D.5 |
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【推荐2】二次函数
的图像如图所示,若关于x的一元二次方程
(t为实数)的解满足
,则t的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/572f286fb45b2757af63569ae0bc2e99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b220bcd235d0c003be3084295cd53f07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec0345ad2eb83035986f0ad4d3abaa44.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/43fb7f08-1af0-4bfd-80e8-617e0c6b5e8c.png?resizew=190)
A.![]() | B.![]() | C.![]() | D.![]() |
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