在平面直角坐标系
中,对于A,B两点给出如下定义:若点A到x、y轴的距离中的最大值等于点B到x、y轴的距离中的最大值,则称A,B两点为“同值点”.
例如,图中的A,B两点即为“同值点”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/3b7b3b18-18d7-4128-a218-12e138de5697.png?resizew=168)
(1)已知点P的坐标为
,
①在点
中,是点P的“同值点”的有____________;
②若点Q在直线
上,且P,Q两点为“同值点”,则点Q的坐标为___________;
(2)若
是直线
上的两点,且
与
为“同值点”,求k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
例如,图中的A,B两点即为“同值点”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/482f2820-2c42-4892-801b-45ce0d73d95f.png?resizew=191)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/3b7b3b18-18d7-4128-a218-12e138de5697.png?resizew=168)
(1)已知点P的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/148d97803c3b16893ced41ad5cd9aba4.png)
①在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3470fe9b9edba7c805e7ab366073295d.png)
②若点Q在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08e80c699eabb025fb94e1830822ca9b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a560a147284f8629d6dc24165d110f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/188c67c15af0f62f0386b493c1ac0d9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b104090ea2ac34be58a76a4e0e95cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1d9b712b639c8b6809c9f3ae03706.png)
更新时间:2022-07-17 05:30:03
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【推荐1】在平面直角坐标系
中,点
坐标为
,点
坐标为
,过点
作直线
轴,垂足为
,交线段
于点
.
![](https://img.xkw.com/dksih/QBM/2019/8/9/2265109719564288/2265865108398080/STEM/4d6f88a41e1f489da977adb6c7634db7.png?resizew=337)
(1)如图1,过点
作
,垂足为
,连接
.
①填空:
的面积为______;②点
为直线
上一动点,当
时,求点
的坐标;
(2)如图2,点
为线段
延长线上一点,连接
,
,线段
交
于点
,若
,请直接写出点
的坐标为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1a65d88f9823d49da8f3b96ea9ec6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ed24bfcc37b79fe9ca61ed8fdf26ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df49179dbfbc8e207aa92fd72060fba1.png)
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(1)如图1,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
①填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90736ce6e1bda1ded3d438e2a584407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bffea4369fc1dda4573ab8a3166b42a.png)
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【推荐2】在平面直角坐标系
中,给出如下定义:点A到x轴、y轴距离的较大值称为点A的“长距”,当点P的“长距”等于点Q的“长距”时,称P,Q两点为“等距点”.
.
①则点A的“长距”是 .
②在点
,
,
中,为点A的“等距点”的是______;
③若点B的坐标为
,且A,B两点为“等距点”,则m的值为______;
(2)若
,
两点为“等距点”,求k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2157b41548f02a86a438e63238719841.png)
①则点A的“长距”是 .
②在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb3fc0283e1c8dd515e37e2af5e1834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad9053d5737eece07976764d700c1854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a16e0e20ba9b1157d33012902a5fb0df.png)
③若点B的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c8710970fd234d80bb00286148aec8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4349ad4521dd5a1104f7cc4ffa1f0c27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143e4836de09b8855b153ddd1e0475f7.png)
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【推荐1】如图,已知函数
的图象与y轴交于点A,一次函数
的图象经过点
,与x轴以及
的图象分别交于点C,D,且点D的坐标为
.
,
,
;
(2)若函数
的值大于函数
的函数值,则x的取值范围是 ;
(3)则四边形
的面积 ;
(4)在平面内是否存在点P,使得以点P,C,D为顶点的三角形是以
为腰的等腰直角三角形,若存在,请直接写出点P的坐标;若不存在,请说明理由.
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(2)若函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
(3)则四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8735e2de0ec29640d1eff9e043556030.png)
(4)在平面内是否存在点P,使得以点P,C,D为顶点的三角形是以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐2】某农作物的生长率p与温度t(℃)有如下关系;如图,当
时可近似用函数
刻画;当
可近似用函数
刻画.
![](https://img.xkw.com/dksih/QBM/2023/3/24/3201622389465088/3213970374303744/STEM/deef80acd8ce41b6a3643cfa23ab0092.png?resizew=217)
![](https://img.xkw.com/dksih/QBM/2023/3/24/3201622389465088/3213970374303744/STEM/cfdef3d71223429baa0ca62bd4a5bf2d.png?resizew=230)
(1)求h的值.
(2)按照经验,该作物提前上市的天数m(天)与生长率p之间满足已学过的函数关系,部分数据如下:
求:①m关于p的函数表达式;
②用含t的代数式表示m.
③天气寒冷,大棚加温可改变农作物生长速度.大棚恒温20℃时每天的成本为100元,计划该作物30天后上市.现根据市场调查:每提前一天上市售出(一次售完),销售额可增加600元.因此决定给大棚继续加温,但加温导致成本增加,估测加温到
时的成本为200元/天,但若欲加温到
,由于要采用特殊方法,成本增加到400元/天,问加温到多少度时增加的利润最大?并说明理由.(注:农作物上市售出后大棚暂停使用)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90ff024a7e029636821a1b0490e7526.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e98f968b0f016cf2d82c9d0c1486bbd4.png)
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![](https://img.xkw.com/dksih/QBM/2023/3/24/3201622389465088/3213970374303744/STEM/cfdef3d71223429baa0ca62bd4a5bf2d.png?resizew=230)
(1)求h的值.
(2)按照经验,该作物提前上市的天数m(天)与生长率p之间满足已学过的函数关系,部分数据如下:
生长率p | 0.2 | 0.25 | 0.3 | 0.35 |
提前上市的天数m(天) | 0 | 5 | 10 | 15 |
②用含t的代数式表示m.
③天气寒冷,大棚加温可改变农作物生长速度.大棚恒温20℃时每天的成本为100元,计划该作物30天后上市.现根据市场调查:每提前一天上市售出(一次售完),销售额可增加600元.因此决定给大棚继续加温,但加温导致成本增加,估测加温到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c22b0f4341af8e8d49ddc16242bb99a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64ef3d2402f8e965f15b8a482e38ebbd.png)
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