如图,
,
是等腰直角三角形,
,顶点
,
分别在
的两边
,
上滑动(不与点
重合),
的外接圆交
于点
,
为圆心.
(1)连接
,
,则
______;
(2)当点
在点
的右侧时
①求证:
;
②若
,
,求
的面积
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e80371754b2bb6259920dd580ba24f37.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/916aa68e47334ba3b95cd7d99f67c6b3.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cedd51383f8f047f565191b128cec637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcbeafdea777010c3b38c7da3c3768d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://img.xkw.com/dksih/QBM/2020/3/18/2422082867740672/2422151933313024/STEM/0aaecaab385240dea6543bfedbb8eced.png?resizew=159)
19-20九年级上·浙江杭州·期末 查看更多[1]
(已下线)【新东方】初中数学771【2019年】【初三上】
更新时间:2020-03-18 13:03:38
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】如图,在平面直角坐标系
中,
,
.已知抛物线
.
![](https://img.xkw.com/dksih/QBM/2022/3/19/2939426337079296/2954042634772480/STEM/30757a4a-863b-427c-b51d-0c8ba30e472a.png?resizew=193)
(1)求抛物线的对称轴.
(2)若当
时,函数的最大值为10,求a的值.
(3)若抛物线的顶点在
的内部(不含边界),求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115a0c87ac14dbb770c95d74d6e26073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8290733c83028f6e03753f66ac263ba3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ec9d4ffdc12607244d03d6f36f9af5.png)
![](https://img.xkw.com/dksih/QBM/2022/3/19/2939426337079296/2954042634772480/STEM/30757a4a-863b-427c-b51d-0c8ba30e472a.png?resizew=193)
(1)求抛物线的对称轴.
(2)若当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8f84f5de5d5fe7a643ddfb4ee243eb.png)
(3)若抛物线的顶点在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
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【推荐2】如图,已知二次函数
的图象经过点
,点
,点
在该二次函数图象上
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/a62c33b4-7b9f-4476-b12d-a63969fa8395.png?resizew=127)
(1)求该二次函数的解析式及其顶点坐标;
(2)若
时,
的最大值为10,最小值为1,请结合图象直接写出
的取值范围;
(3)若点
在直线
的上方,且
面积为S,求S关于
的函数关系式,并说明
取何值时,S有最大值,最大值是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6329198247b9c39bb31f0ce7e08f1f57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a682ceca64f8b53216746fb76f3e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5356182cc3bc478f7c2e3e6dee25e58d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/a62c33b4-7b9f-4476-b12d-a63969fa8395.png?resizew=127)
(1)求该二次函数的解析式及其顶点坐标;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0e555245cd707a2d1f742caa9e1fd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐1】如图
,在
中,
,
于点
,
平分
,交
于点
,交
于点
.
(1)若
,求证:
;
(2)如图
,作
交
于点
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](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/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/fb49dc06-4b02-47dc-9104-186a82911414.png?resizew=366)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/086e1bac58cd269cac781ce0f70c083f.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
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名校
【推荐2】矩形
中,
、
交于点O,
(k为常数).作
,
、
分别与
、
边相交于点E、F,连接
,
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957150434394112/2961045936594944/STEM/f21a1772-136f-48a5-bee9-a6af863fc95d.png?resizew=498)
(1)发现问题:如图1,若
,猜想:
______;
(2)类比探究:如图2,
,探究线段
,
之间的数量关系,并说明理由;
(3)拓展运用:如图3,在(2)的条件下,若
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57fdde5c60611ad99eac513a724492da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/319ff9f648fedec284a11a9761cb6183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957150434394112/2961045936594944/STEM/f21a1772-136f-48a5-bee9-a6af863fc95d.png?resizew=498)
(1)发现问题:如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/296e84ad7592188c975912ba17af0ee3.png)
(2)类比探究:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c525393775354325cbf7839366ca50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
(3)拓展运用:如图3,在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb6abd4e67785049f8ea82d2309f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69e26838e7dbb6febf2fc04db05893a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76ef25427331ab3c7190da269561a56a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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名校
解题方法
【推荐1】在四边形
中,
,对角线
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/9991f244-9351-4b77-83c5-02e56db5a623.png?resizew=415)
(1)如图1,若
,且
,直接写出线段
、
、
的数量关系.
(2)如图2,若将(1)中的条件“
”去掉,求边
、
与对角线
的数量关系.请证明.
(3)如图3,若
,直接写出边
、
与对角线
的数量关系(用
来表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173904239da66b7bef7cb1d997cc40ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/9991f244-9351-4b77-83c5-02e56db5a623.png?resizew=415)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32450995497b9e341be832e9efad3114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.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/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图2,若将(1)中的条件“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.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/60ef95894ceebaf236170e8832dcf7e3.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f863110b7c97615550d1d34ee43d7fe9.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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【推荐2】如图,已知直线l1:y1=kx+b(k≠0)经过点A(﹣1,0),与另一条直线l2:y2=nx﹣6n(n≠0)交于点B(2,3),直线l2与x轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/13/464d72c3-2748-41a9-bc9a-481738fb5255.png?resizew=459)
(1)求直线l1的解析式,并写出y1>y2>0时,x的取值范围.
(2)若点D在直线AB上,且D的横坐标为﹣
,过D作直线DQ,直线DQ交y轴于Q点,且△DQB的面积为12,求Q点的坐标.
(3)点P为x轴上一个动点,连接BP,求
CP+BP的最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/13/464d72c3-2748-41a9-bc9a-481738fb5255.png?resizew=459)
(1)求直线l1的解析式,并写出y1>y2>0时,x的取值范围.
(2)若点D在直线AB上,且D的横坐标为﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
(3)点P为x轴上一个动点,连接BP,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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解答题-证明题
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较难
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解题方法
【推荐1】已知:△ABC 内接于⊙O,过点 A 作⊙O 的切线交 CB 的延长线于点 P,且∠PAB=45°.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/f30f05f5-63b7-4ed8-bc91-7b58a1f0c255.png?resizew=726)
(1)如图 1,求∠ACB 的度数;
(2)如图 2,AD 是⊙O 的直径,AD 交 BC 于点 E,连接 CD,求证:AC CD
;
(3)如图 3 ,在(2)的条件下,当 BC 4
CD 时,点 F,G 分别在 AP,AB 上,连接 BF,FG,∠BFG=∠P,且 BF=FG,若 AE=15,求 FG 的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/f30f05f5-63b7-4ed8-bc91-7b58a1f0c255.png?resizew=726)
(1)如图 1,求∠ACB 的度数;
(2)如图 2,AD 是⊙O 的直径,AD 交 BC 于点 E,连接 CD,求证:AC CD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b5c724bfaeca583ee629b746e6b510c.png)
(3)如图 3 ,在(2)的条件下,当 BC 4
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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【推荐2】如图,在
中,
,以斜边
上的中线
为直径作
,分别与
交于点
.
(1)过点
作
于点
,求证:
是
的切线;
(2)连接
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571ef38fc225d102bcd4f35bab70078c.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ed1fce01430ae31294c29d626626f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
(1)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc936d478f47c519ce4aea86dd1e942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2850bc7459020ef18f580b0b9a2a68fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2020/2/20/2403100077047808/2403319876567040/STEM/8579897344c347b2a04e0339dd10a3ef.png?resizew=294)
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