将二次函数
的图象在x轴上方的部分沿x轴翻折后,所得新函数的图象如图所示.当直线
与新函数的图象恰有3个公共点时,b的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3236d825b994ee9c28e5d5479a57b8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07565f10847840e0fb07b05218ad17fa.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-05-11 09:01:56
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【推荐1】对于一次函数
,下列结论错误的是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de869ae6b6dc5b79fcae3de540b30bf.png)
A.函数的图象与![]() ![]() |
B.函数的图象不经过第三象限 |
C.函数的图象向下平移4个单位长度得![]() |
D.函数值随自变量的增大而减小 |
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【推荐2】将二次函数
的图象在
轴上方的部分沿
轴翻折后,所得新函数的图象如图所示.当直线
与新函数的图象恰有
个公共点时,
的值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/26/352734da-6a3d-4680-9f6c-3536a39149b8.png?resizew=114)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3236d825b994ee9c28e5d5479a57b8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07565f10847840e0fb07b05218ad17fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/26/352734da-6a3d-4680-9f6c-3536a39149b8.png?resizew=114)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
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【推荐1】已知二次函数
,当
时,x的取值范围是
,且该二次函数的图象经过点
两点,则s的值可能是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/410c31228a2cae02fdaa677e72edc54f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b06b3dd03223c39333e58a326e5b0ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c096c8c8ac639fa8ee12c1de5c344f14.png)
A.3 | B.2 | C.0 | D.1 |
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【推荐2】若二次函数
的图象只经过第一、二、三象限,则m满足的条件一定是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d41362ec48e316b6f85640eac0c2925.png)
A.![]() | B.![]() | C.![]() ![]() | D.![]() |
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【推荐1】已知,二次函数
与
轴有两个交点,且
为正整数,当
时,对应函数值
的取值范围是
,则满足条件的
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df489d24722b14bc221fce035a0c0474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbdba7e66d1b7c81e8fd2d48a04c9687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0601b2fc9253cdddaee9eb38c1d4f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
A.2 | B.![]() | C.![]() | D.![]() |
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【推荐2】二次函数
(其中
),下列说法正确的( ).
①图象与x轴有两个公共点;
②对于任意
,图象经过定点
;
③图象顶点在第四象限;
④当
时,都有y随着x的增大而增大;
⑤若当
时,都有y随着x的增大而减小,则
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cdba95b4fcf18a2bc42e4dbfa13a1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
①图象与x轴有两个公共点;
②对于任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e03f83124a357729fd6783606a0b1f7.png)
③图象顶点在第四象限;
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0aa2ef928b6e3341d0a0dc6d8055b9.png)
⑤若当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8316941157dc217c8b1c83dda77121a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33851ab3a04bdac03c43642fe1f706e3.png)
A.①②③④ | B.②③④ | C.①③⑤ | D.②⑤ |
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【推荐1】如图,
中,
,点D是边
上一点,连接
,将
沿
所在直线折叠得到
,点F是点A的对应点,
与
交于点E,下列结论一定正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c7b7be09862e90dd0065ec7b712e024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/1/aab06fa8-89d6-461e-ad63-d6726a7c2145.png?resizew=100)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,把一张两边分别平行的纸条折成如图所示,EF为折痕,ED交BF于点G,且∠EFB=48°,则下列结论: ①∠DEF=48°;②∠AED=84°;③∠BFC=84°;④∠DGF=96°,其中正确的个数有( )
![](https://img.xkw.com/dksih/QBM/2019/3/28/2170310467952640/2171568891248640/STEM/38e8600673c3485897a655161fd16924.png?resizew=196)
![](https://img.xkw.com/dksih/QBM/2019/3/28/2170310467952640/2171568891248640/STEM/38e8600673c3485897a655161fd16924.png?resizew=196)
A.4个 | B.3个 | C.2个 | D.1个 |
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