1 . 已知二次函数
,当
时,
或
.若
,
是抛物线
上的两点,且
,则
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6914fa70f4ac46e97041dc6e71d6db21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa4ed631aec0da5147761a988bc9594.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e981fffca6faf2220787b92d907d649.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1bd830dc25b7fc562a8705f583aa5ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef9fcb12d7f84c05a90a82c3ee970bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342b666f58972815306763d9ccc3bc6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() ![]() | C.![]() | D.![]() ![]() |
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2 . 在平面直角坐标系中,对于任意两点
与
的“可控距离”,给出如下定义:
若
,则点
与
的“可控距离”为
;
若
,则点
与
的“可控距离”为
.
,点
,求点P与点Q的“可控距离”.
(2)已知点
,B为x轴上的一个动点.
①若点A与点B的“可控距离”为6,试求出满足条件的点B的坐标;
②直接写出点A与点B的“可控距离”的最小值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec391f08f1452fb3e0aebe7e12ba4fb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3a4422395ca20fe847419ec569e48b9.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9697efe8c08f32734b40bd94d646bbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec391f08f1452fb3e0aebe7e12ba4fb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3a4422395ca20fe847419ec569e48b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24acaad3e4a83c102702155e5df281e2.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e462ebf5bf2b3222369230ad4058fcb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec391f08f1452fb3e0aebe7e12ba4fb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3a4422395ca20fe847419ec569e48b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5a9e7bdd4c5e9c99062edf7f6336ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5ec778a930414ab45d2e4457b459add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdebfa07f9b53d79d119cd3a1048e78a.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e10de2c38bc918ae9e1ce62a5c70099.png)
①若点A与点B的“可控距离”为6,试求出满足条件的点B的坐标;
②直接写出点A与点B的“可控距离”的最小值为 .
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名校
3 . 如图1,数轴上点O表示的数是0,点A表示的数是,点P是数轴上一动点,表示的数是x,它与点A之间的距离
用y表示.
(1)填写下表,在平面直角坐标系内画出y关于x的图象(图2);
… | 0 | … | ||||||
… | 2 | 1 | 0 | 1 | 2 | 3 | … |
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8076b511e27939c629762296b8cfd08.png)
(3)下列说法正确的序号是______;
①变量x是变量y的函数;
②随x的增大而减小;
③图象经过第一、二、三象限;
④当时,y有最小值;
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b388771dbf7feff78d1f438a8fce14b.png)
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4 . 若不等式
有解,则实数
的最小值是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d497658bfd8faf958c7630834e8eea03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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5 . 已知二次函数
的图象与
轴交于不同的两点
、
,顶点为点
,且
,则代数式
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5bd57912b194186fb5cbe63ed24861.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88062563f66dcd774e8a3ec6f105cb6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f92f292a7a4c1af186d64dc6f6d2441.png)
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6 . 若不等式
对任意实数
都成立,则
的最大值为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2926f89e85c45f610f140178561683b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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7 . 无论
取何值,
都成立,则
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822363cb71c7ce0b74b66b41f0a11e63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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名校
8 . 在平面直角坐标系
中,已知点
.对于点
给出如下定义:当
时,若实数
满足
,则称
为点
关于点
的距离系数.若图形
上所有点关于点
的距离系数存在最小值,则称此最小值为图形
关于点
的距离系数.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/9babb6d8-ad4d-45a3-ad8c-2043b3955b3d.jpg?resizew=439)
(1)当点
与点
重合时,在
,
,
中,关于点
的距离系数为1的是________;
(2)已知点
,
,若线段
关于点
的距离系数小于
,则
的取值范围为________;
(3)已知点
,
,其中
.以点
为对角线的交点作边长为2的正方形,正方形的各边均与某条坐标轴垂直,点
,
为该正方形上的动点,线段
的长度是一个定值(
).
①线段
关于点
的距离系数的最小值为________;
②若线段
关于点
的距离系数的最大值是
,则
的长为________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c65d3d6119b18fd2427497cbd413c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44ee82573986d4fa6a7ee1b5f397edae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cd5f68f8223717c5f9e7a35da919f60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92870e417ccd340af3958ddd75638ae9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/9babb6d8-ad4d-45a3-ad8c-2043b3955b3d.jpg?resizew=439)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fcbf295d7d986f28146eb8183949578.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0006f11654b3374dd05773b476fcf28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d161069e22da57aca921fc1fceb8768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82f24f50671894153d96f948a81b985b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0127f39dfe053a96c3e3efd6e8c7316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ad1571f3e086682201bbd7b822e25d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0d256036d52b784b8c68bfc8db69d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4650d0b8debc4d6ae9a3c2a93ed7ec9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/849c17bd6fd63b1ca11138e55dd1544d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6aad705eec7e729c6450c11c1182a00.png)
①线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
②若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4c67b52fb0b1da181eb90652eb326f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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9 . 在平面直角坐标系
中,对于给定的两点
,
,若存在点
,使得
的面积等于1,即
,则称点
为线段
的“单位面积点”,解答下列问题:如图,在平面直角坐标系
中,点
的坐标为
.
(1)在点
,
,
,
中,线段
的“单位面积点”是___________;
(2)已知点
,
,将线段
沿
轴向上平移
个单位长度,使得线段
上存在线段
的“单位面积点”,直接写出
的取值范围___________;
(3)已知点
,
,点
,
是线段
的两个“单位面积点”,点
在
的延长线上,若
,求出点
纵坐标的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a9dabb53dc826019fc8b6ae6d940c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31d9e24038975f71a10eefd8b37614ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/2/8d30d0af-eb51-4585-874a-999c4de2a08b.png?resizew=252)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/2/684efde0-3a31-467f-920d-2d24b007c02f.png?resizew=252)
(1)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115a0c87ac14dbb770c95d74d6e26073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98ef6b26186130f8d88c66d3b3c78fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9446ea29ddb6650a5a0cf7ac6f17d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42dfd5e4adda5115c8360f04f4b9c453.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb3fc0283e1c8dd515e37e2af5e1834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d6f24360254bdf9d1b47563cf1acf85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf4b43b6792b9ae78a1c8cae4e60524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b868f0dccfda77ad40405e09fd47bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e095ca9b42dcdc16d40e08b09f014607.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/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c018b37259f3ead2ab2d94bd744f44d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/340674c438b7a81303e6a1e50bbde741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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10 . 阅读以下例题:
解方程:
,
解:①当
时,
原方程可化为一元一次方程
,
解这个方程得
;
②当
时,
原方程可化为一元一次方程
,
解这个方程得
;
③当
,即
时,
原方程可化为
,不成立,
此时方程无解.
所以原方程的解是
或
.
(1)仿照例题解方程:
.
(2)探究:当b为何值时,方程
满足:
①无解;②只有一个解;③有两个解.
解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4b47e162a9831da88f272305cdc89d3.png)
解:①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8b8186c2bc944e246300a616bb5755.png)
原方程可化为一元一次方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589586c5c93415eb0a07a86835de43dd.png)
解这个方程得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fac9575a5985527e283f7295fdaf72c.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b706652685661e0084b57271945cb51b.png)
原方程可化为一元一次方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d949c6cacbaa3209157dab74902f7ea5.png)
解这个方程得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9ad96a0492c77ae833043352654a98b.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa83d155be5cbbacc6bf35135a58f6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
原方程可化为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f90eb4b226ba2b7d214b80b433ec6.png)
此时方程无解.
所以原方程的解是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fac9575a5985527e283f7295fdaf72c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9ad96a0492c77ae833043352654a98b.png)
(1)仿照例题解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcc62e5fc90644965d06fd3a9f19e10.png)
(2)探究:当b为何值时,方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d4358296758ac52100177aae9af031c.png)
①无解;②只有一个解;③有两个解.
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