如图,四边形
是菱形,
,点E是
边上一动点,连接
,在
右侧作菱形
使得菱形
菱形
,连接
交
于点R,连接
.
(1)求证:
;
【深入探究】
(2)若R为
中点,求
的值;
【拓展延伸】
(3)①若
,
是等腰三角形,求
的值;
②若D,F,G三点共线,连接
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10eec76d00779458ce81639d71c635d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98bbe3fda93f6415602f3f8e09a2a649.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10eec76d00779458ce81639d71c635d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dfe7a6665d1b083d3925ba3ed32b261.png)
【深入探究】
(2)若R为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535ceeaa1cbe8318b1df5efcbebff584.png)
【拓展延伸】
(3)①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40560ea08d6cd8c1d4d9661ee6faaa3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9d8d9905187fff191215dd4ea5375f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca3bd41676f6b69acac00a292fe134cd.png)
②若D,F,G三点共线,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e217e7bba50852cb12c8c4b4646690.png)
更新时间:2024-04-20 08:28:08
|
相似题推荐
解答题-证明题
|
困难
(0.15)
【推荐1】定义:三角形两个内角的平分线相交所成的钝角称为该三角形第三个内角的好望角.
是
中
的好望角,
,请用含
的代数式表示
.
(2)如图2,在
中,
的平分线与经过
两点的圆交于点
,且
.求证:
是
中
的好望角.
(3)如图3,在 (2)的条件下,
①取弧
的中点
,连接
,若
,求圆的半径
.
②若
,
,请直接写出线段
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd465973943bcd766b5275ee204bbf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0520e9675bc1b416e8b8f01eb69fd13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad0e1aad100c38924376c767de64f685.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
(3)如图3,在 (2)的条件下,
①取弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a1d213d431a13d9ae97387f0f84ab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be35ae8c8327e60b64e87004af9b938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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解题方法
【推荐2】已知四边形ABCD中,AD∥BC,∠D=90°,AC平分∠BAD,∠ACD=30°
(1)如图1,求证:△ABC是等边三角形;
(2)如图2,点E在边BA的延长线上,在边BC上取一点F,连接EC、EF且EC=EF,求证:BF=AE;
(3)如图3,在(2)的条件下,连接AF,取AF的中点G,连接BG并延长交线段EC于M,交线段AD于R,过点A作AN∥EC交线段BR于N,若GN=2,EM=5,求CM的长.
(1)如图1,求证:△ABC是等边三角形;
(2)如图2,点E在边BA的延长线上,在边BC上取一点F,连接EC、EF且EC=EF,求证:BF=AE;
(3)如图3,在(2)的条件下,连接AF,取AF的中点G,连接BG并延长交线段EC于M,交线段AD于R,过点A作AN∥EC交线段BR于N,若GN=2,EM=5,求CM的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/d6b72429-9a29-4742-9683-028f192e4000.png?resizew=425)
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【推荐1】阅读材料:如图1,若点P是⊙O外的一点,线段
交⊙O于点A,则
长是点P与⊙O上各点之间的最短距离.
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629566216749056/2629718161227776/STEM/076e2ca4-a62f-40b3-9c3d-465628db78eb.png?resizew=655)
证明:延长
交⊙O于点B,显然
.
如图2,在⊙O上任取一点C(与点
不重合),连结
.
,
且
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64076dbb743869c8bafa73c0eb81bc61.png)
的长是点P与⊙O上各点之间的最短距离.
由此可得真命题:圆外一点与圆上各点之间的最短距离是这点到圆心的距离与半径的差.
请用上述真命题解决下列问题.
(1)如图3,在
中,
,以
为直径的半圆O交
于
是弧
上的一个动点,连接
,则
长的最小值是________.
(2)如图4,在边长为2的菱形
中,
是
边的中点,点N是
边上一动点,将
沿
所在的直线翻折得到
连接
.
①点
的轨迹是______(填直线、线段、圆、半圆)
②求线段
长的最小值.
(3)如图5,已知正方形
的边长为4,点G是以
为直径的半圆O上的一动点,点P是
边上另一动点,连接
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629566216749056/2629718161227776/STEM/076e2ca4-a62f-40b3-9c3d-465628db78eb.png?resizew=655)
证明:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ee8ad7763286fbd4c7c211d48d04e48.png)
如图2,在⊙O上任取一点C(与点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e499d4913f7ec9ed0c09eb7b795104a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4facae94291a786b32df29feebf440ad.png)
且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99154aeec150063cf6b693d2a6720a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64076dbb743869c8bafa73c0eb81bc61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced8bf22ee29afc96711c940898976ce.png)
由此可得真命题:圆外一点与圆上各点之间的最短距离是这点到圆心的距离与半径的差.
请用上述真命题解决下列问题.
(1)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d02e7d2cb8252f6aaa973488b9f3beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6b1e3dfb2e3e9bf0b52e417a1ca5a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(2)如图4,在边长为2的菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292b0198c0c19dbebf27e14142ddb56f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8e7040c2fd8a163d71e35805775feb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
②求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
(3)如图5,已知正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0eaf17dbb968767ef68755c2c33071.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ab11b1a4e9ac7bcf7746bf45160e83e.png)
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629566216749056/2629718161227776/STEM/67ff1001-2bcd-4363-b6f8-8b50fc22d0a4.png?resizew=146)
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【推荐2】如图,在
中,
,点C在线段
的延长线上,过点C作
,连接
,再过点A作
于点F;
(1)如图1,连接
,若
,
,
,
,求线段
的长;
(2)如图2,在线段
上取一点H,连接
、
,当
平分
,
时,求证:
.
(3)如图3,在(2)的条件下,连接
,若
,
,当
取得最小值时,请直接写出线段AH的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cec4464b5efa55e9b33a677d983667e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1070d38d2fea1dc88c6eb31d320b763.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151adae7bf60f109d3f275fd9fd4e5b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fbee06d305abf6692125513dc3757f9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/18/1dd688b5-fce9-4a3c-a5fa-4f4fb9071c2a.png?resizew=630)
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f57b8380e1c9d059087e2bd121153f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4a288554fe25fe0a72530eb29756e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eeb94acdc3de00655e6e29d5372da09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070bc896d35495237fd65576e9b6f88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)如图2,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84c38ffc474f45993a7ed1e3cd5da75a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd728a6215befed4255a5d5b33f93c7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9a292b485647363ceb6d7da445cd9fc.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b91dc345be51a286768fd52ebc3f3d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6e68e329ee8e588093c2969f7123af4.png)
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【推荐3】在△ABC中,AB=AC,∠BAC=120°,点F在线段AC上,连接BF,延长CA至点D,连接BD,满足∠ABF=∠ABD,H是线段BC上一动点(不与点B、C重合),连接DH交BF于点E,交AB于点G.
![](https://img.xkw.com/dksih/QBM/2022/3/13/2935370954424320/2938843642241024/STEM/1dab8a02-6338-4b81-8f99-2981f9fb360a.png?resizew=614)
(1)如图①,若∠ABF=∠FBC,BD=2,求DC的长;
(2)如图②,若∠CDH+∠BFD
∠DEF,猜想AD与CH的数量关系,并证明你猜想的结论:
(3)如图③,在(1)的条件下,P是△BCD内一点,连接BP,DP,满足∠BPD=150°,是否存在点P、H,使得2PH+CH最小?若存在,请直接写出2PH+CH的最小值.
![](https://img.xkw.com/dksih/QBM/2022/3/13/2935370954424320/2938843642241024/STEM/1dab8a02-6338-4b81-8f99-2981f9fb360a.png?resizew=614)
(1)如图①,若∠ABF=∠FBC,BD=2,求DC的长;
(2)如图②,若∠CDH+∠BFD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50a39604477d1d9326eb455cda2e838.png)
(3)如图③,在(1)的条件下,P是△BCD内一点,连接BP,DP,满足∠BPD=150°,是否存在点P、H,使得2PH+CH最小?若存在,请直接写出2PH+CH的最小值.
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【推荐1】综合与实践课上,梦班数学学习兴趣小组对图形中两条互相垂直的线段间的数量关系进行探究时,遇到以下问题,请你逐一加以解答:
如图1,在正方形
中,点E,F,G,H分别在边
,
,
,
上,且
,若
,则
的长为 ;
如图2,在矩形
中,
,点E,F,G,H分别在边
,
,
,
上,且
,若
,则
的长为 ;
(2)迁移探究
如图3,在
中,
,
,点D,E分别在边
,
上,且
,试证明:
;
(3)拓展应用
如图4,在矩形
中,
,
,
平分
交
于点E,点F为
上一点,
交
于点H,交矩形
的边于点G.当F为
的三等分点时,请直接写出
的长.
如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de64cbea23ec8a57a4705d9f16297d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e7c422a19b68b8b4cd484d22897e3a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151f7aef7d0f56e18562f5a4030cf815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de64cbea23ec8a57a4705d9f16297d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e4ceabf0daf448d295489a489a6868.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
(2)迁移探究
如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49bf9b30a14cdedf26b9526097a300e5.png)
(3)拓展应用
如图4,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fac5ca06ed1e682ae9ce8e029dbfef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
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解答题-问答题
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困难
(0.15)
名校
【推荐2】在平面直角坐标系
中,关于点P和图形G给出如下的定义:若在图形G上存在两点M,N使得
,作
于Q,则称Q为P关于图形G的射影点.
(1)当
的半径为2时,
①在点
,
,
中,关于
的射影点存在的有 ;
②点P在直线
上,若P关于
的射影点Q存在且唯一,求点P的坐标;
(2)
的圆心在x轴上,半径为
,直线
与x轴、y轴交于点A、B.若线段
上存在点P,使得点P关于
的射影点Q满足
,直接写出圆心T的横坐标t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cb4eb87fd9c474fea913e4b68818abd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7555f635da615b09b7e2f08ddbeaf1db.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
①在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79fef5c2bdeab99d9d397c2dce4b416d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a4ab56314c6d123f788b6cea966b2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aac9399ea6c9cabde6ebae1517c874f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
②点P在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3b4416a186069ad6dbe9d9c1ed76e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9347ab0d001ed7e8f51f9886ce88ac64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19e61a27008aa1e89f9eb8d372db41bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9347ab0d001ed7e8f51f9886ce88ac64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e448765ff3aa4ae337c12ea208c9008.png)
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困难
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【推荐1】如图,在平面直角坐标系中,抛物线y=-x2+bx+c与x轴相交点A(-1,0)和点B(3,0),与y轴相交于点C,抛物线的顶点为点D,对称轴交x轴于点E,点Q为线段DE上一点,联结AC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/0fd525cd-0e79-491d-a5d4-0b72f31b930a.png?resizew=602)
(1)求这条抛物线的表达式及对称轴;
(2)当∠ACO=∠QOE时,求
的值;
(3)当∠ACO=∠QOC时,判断四边形ACQO的形状;
(4)(附加题)当∠ACO=
∠AQE时,求∠BQE的余切值;
(5)(附加题)当∠ACO=∠CBQ时,判断△BCQ的形状.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/0fd525cd-0e79-491d-a5d4-0b72f31b930a.png?resizew=602)
(1)求这条抛物线的表达式及对称轴;
(2)当∠ACO=∠QOE时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e32041dd779915f7b2785c66c2457686.png)
(3)当∠ACO=∠QOC时,判断四边形ACQO的形状;
(4)(附加题)当∠ACO=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(5)(附加题)当∠ACO=∠CBQ时,判断△BCQ的形状.
您最近一年使用:0次
解答题-问答题
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困难
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【推荐2】已知:在平面直角坐标系中,点
为坐标原点,抛物线
分别交
轴于点
、
,交
轴于点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/a18db475-1e76-4277-95ec-42f9939492d9.png?resizew=683)
(1)如图1,求抛物线解析式;
(2)如图2,点
第一象限抛物线上一点,连接
、
,设
的面积为
,点
的横坐标为
,求
与
的函数关系式;(不要求写出自变量的取值范围);
(3)如图3,在(2)的条件下,过点
作
轴于点
,作
于点
,交
轴于点
,连接
,
为
的中点,点
在
的延长线上,连接
、
、
,若
,四边形
的面积等于
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/326cef14ea878f4c63ec0bcaa1bf8e15.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/518a3d39ec79a1e10e02163c0f187460.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/a18db475-1e76-4277-95ec-42f9939492d9.png?resizew=683)
(1)如图1,求抛物线解析式;
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图3,在(2)的条件下,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f00d0ff8dd38da17167cf9b789eec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2ef99db257cc1acb08e3a5e0006d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae626b30192bba5c433d399bba65411.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a16f5621716bfef7a056a3f2712feb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5d3887ab824e5e672328dd2dfc0ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/282826a1cd96387aad580c8c4ac64a41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101d1860df413bc59eb9de64ade35d19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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