在一个三角形中,如果三个内角的度数之比为连续的正整数,那么我们把这个三角形叫做和谐三角形.
为和谐三角形,且
,则
=
,
=
,
=
.(任意写一种即可)
(2)问题探究:如果在和谐三角形
中,
,那么
的度数是否会随着三个内角比值的改变而改变?若
的度数改变,写出
的变化范围;若
的度数不变,写出
的度数,并说明理由.
(3)拓展延伸:如图,
内接于
,
为锐角,
为圆的直径,
.过点
作
,交直径
于点E,交
于点
,若
将
分成的两部分的面积之比为
,则
一定为和谐三角形吗?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fad96883c68777c8f068426a4da383c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)问题探究:如果在和谐三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fad96883c68777c8f068426a4da383c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
(3)拓展延伸:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b100dc90c37518567bf90f9d17de4766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1acf73afe897ced8cdb80e609d8be230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
2024·浙江宁波·模拟预测 查看更多[4]
2024年4月浙江省宁波市山海联盟九年级中考数学联考数学模拟预测题 (二)2024年江苏省常州市第二十四中学、教科院、市实验中学联考中考一模数学试题(已下线)重难点07+圆中的计算及其综合2(4考点7题型)2024年江苏省宿迁市沭阳县沭河中学中考三模数学试题
更新时间:2024-06-06 06:21:50
|
相似题推荐
解答题-证明题
|
困难
(0.15)
【推荐1】探究:如图1,△ABC是等边三角形,在边CB、AC的延长线上截取BE=CD,连结BD、AE,延长DB交AE于点F.
(1)求证:△BAE ≌ △CBD;
(2)∠BFE= °.
应用:将图1的△ABC分别改为正方形ABCM和正五边形ABCMN,如图2、3,在边CB、MC的延长线上截取BE=CD,连结BD、AE,延长DB交AE于点F,则图2中∠BFE= °;图3中∠BFE= °.
拓展:若将图1的△ABC改为正n边形,其它条件不变,则∠BFE= °(用含n的代数式表示).
(1)求证:△BAE ≌ △CBD;
(2)∠BFE= °.
应用:将图1的△ABC分别改为正方形ABCM和正五边形ABCMN,如图2、3,在边CB、MC的延长线上截取BE=CD,连结BD、AE,延长DB交AE于点F,则图2中∠BFE= °;图3中∠BFE= °.
拓展:若将图1的△ABC改为正n边形,其它条件不变,则∠BFE= °(用含n的代数式表示).
![](https://img.xkw.com/dksih/QBM/2020/10/18/2573823553642496/2577053267935232/STEM/677499c5030d4af3b24a0221d079451c.png?resizew=362)
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【推荐2】如图1,已知直线
分别与直线
,
相交于点
,
,
平分
,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/ab0a9c7b-80a0-4c24-9f94-e407cd4dc4ec.png?resizew=565)
(1)求证:
;
(2)如图2,若
平分
交
的延长线于点
,且
与
的比为
.求
的度数;
(3)如图3,若点
是直线
之间一动点,
平分
交
于点
,过点
作
于点
.根据题意画出图形,请直接写出
与
关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2ee75a234ac05a3225e49ddd8c5065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f68e4414c9ab464bf433385c03705f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/ab0a9c7b-80a0-4c24-9f94-e407cd4dc4ec.png?resizew=565)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982f824aa56c399260dcf6e83d169344.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1460aa3d83df61f6c411b34412135451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dd4f0048b27e6fb7d233c05011b5b1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7494680d3217037fca1bd91e8bd1b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7218ba90f22ab7ae104d16cf92b406.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff51cfdf99a6f1000b0878a6588f5dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86bfa0bbe05b01453e6ed15d74da2602.png)
(3)如图3,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec550f03c63927e9e90fd00e2360b797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c6d79e93915a5fa895bab5436ee2c19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb9fc77f75349c3463fea7effa4e225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acba637d3414f693b819d30e3d35938d.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐1】如图1,
内接于
,作
于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/face113c-971d-4862-a668-49481f19ed19.png?resizew=476)
(1)连结
,
.求证:
;
(2)如图2,若点E为弧
上一点,连结
交
于点F,若
,
,连结
,求证:
平分
;
(3)在(2)的条件下,如图3,点G为
上一点,连结
,
.若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/face113c-971d-4862-a668-49481f19ed19.png?resizew=476)
(1)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd14e1f6fcbf8c976b9acbcbf744e3d.png)
(2)如图2,若点E为弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3115c71208b31d70711d867d0fc2509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a33895978c3beaeeb6a46976d0e640a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36719f1e764ee0e719b65c49fae84677.png)
(3)在(2)的条件下,如图3,点G为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70fc0f559bcc40f3d40f475b21b6aac1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b4d140fee1b5d43c0be7c3e946ffc6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53f4a3c29c6a6e917671a9a946243b32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
您最近一年使用:0次
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名校
【推荐2】如图1,
是
的直径,弦
,垂足为点
,连接
.
,求劣弧
所对圆心角的度数;
(2)在图1中,连接
,若
,求
的值;
(3)①如图2,连接
并延长
交
于点F,交
于点G,若
,求
的长;
②如图2,若
,求关于x的函数关系式.
![](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/a77e3c1c236141d6118429fade0a9b9d.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/0ab5c45a72849d2cae1d65b282b5bd19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)在图1中,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71d51ac20888e84555ea8baa5d92533a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/600e5b951c7065c6bb20e5adc5200e95.png)
(3)①如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c4db20c6aacc636cb6b1eceb665bed8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
②如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1607c5257b012075dc1025e2a863963.png)
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解答题-问答题
|
困难
(0.15)
解题方法
【推荐1】如图,直线y=kx+2与x轴交于点A(3,0),与y轴交于点B,抛物线y=﹣
x2+bx+c经过点A,B.
(1)求k的值和抛物线的解析式.
(2)M(m,0)为x轴上一动点,过点M且垂直于x轴的直线与直线AB及抛物线分别交于点P,N,连接BN.
①若△BPN是直角三角形,求点N的坐标.
②当∠PBN=45°时,请直接写出m的值.(注:当k1•k2=﹣1时,直线y=k1x+b1与直线y=k2x+b2垂直)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/23e9d585-06b3-4835-8bbd-3bd8fcadc4af.png?resizew=248)
(1)求k的值和抛物线的解析式.
(2)M(m,0)为x轴上一动点,过点M且垂直于x轴的直线与直线AB及抛物线分别交于点P,N,连接BN.
①若△BPN是直角三角形,求点N的坐标.
②当∠PBN=45°时,请直接写出m的值.(注:当k1•k2=﹣1时,直线y=k1x+b1与直线y=k2x+b2垂直)
您最近一年使用:0次
解答题-问答题
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困难
(0.15)
【推荐2】已知,在平面直角坐标系中,二次函数
的图象与
轴交于点
,与
轴交于点
,点
的坐标为
,点
的坐标为
.
![](https://img.xkw.com/dksih/QBM/2020/3/12/2417903869345792/2418182619414528/STEM/9da57532e3634682981265ad05605e9a.png?resizew=483)
(1)如图1,分别求
的值;
(2)如图2,点
为第一象限的抛物线上一点,连接
并延长交抛物线于点
,
,求点
的坐标;
(3)在(2)的条件下,点
为第一象限的抛物线上一点,过点
作
轴于点
,连接
、
,点
为第二象限的抛物线上一点,且点
与点
关于抛物线的对称轴对称,连接
,设
,
,点
为线段
上一点,点
为第三象限的抛物线上一点,分别连接
,满足
,
,过点
作
的平行线,交
轴于点
,求直线
的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c468dc5cc34c14a188493a21019e8f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb398137779190b35492d9f06d5fbc3.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcbcd0aebdd8bd688d108834747009f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
![](https://img.xkw.com/dksih/QBM/2020/3/12/2417903869345792/2418182619414528/STEM/9da57532e3634682981265ad05605e9a.png?resizew=483)
(1)如图1,分别求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fd9675c7c6dd0a2dc1ebbdae3a2e45c.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b63d2504bd3ecce8c10560b142356f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70ab5529ff64530146006f706fff45cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59fbd9b5e5d8be69373850d7faebdaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d5c64670824361bb802735211f671f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf38e0c6d85e8e6dec94721447bf1311.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a9fab65671bfafaf00e2970c88f1117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f6c2363ebf4b0a5c59ed132d0922f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa8f0424128ead44b5572c29a5b5f03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1460aa3d83df61f6c411b34412135451.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐1】如图1,抛物线
交x轴于
、B两点(点A在B的左侧),交y轴于点C,且
.
(2)如图2,射线
绕点C顺时针方向旋转
,交抛物线于点D,求点D的横坐标;
(3)如图3,点
,点F在抛物线上,平移线段
至
,使H、G分别与E、F对应,且H、G均落在抛物线上,连
,求证:直线
经过一个定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913f78382630e50543e5f7192cae3ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f842145a92b63d04c0fe88001f01d31e.png)
(2)如图2,射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
(3)如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c4ba91a4a7f07e60510efffe235b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
解题方法
【推荐2】在边长为2的菱形ABCD中,E是边AD的中点,点F、G、H分别在边AB、BC、CD上,且FG⊥EF,EH⊥EF.
(1)如图1,当点
是边
中点时,求证:四边形
是矩形;
(2)如图2,当
时,求
值;
(3)当
,且四边形
是矩形时(点
不与
中点重合),求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/21/23d94c78-ce86-4b71-92d1-7290c7d6086a.png?resizew=501)
(1)如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c5000db80a6fbf8afe6fb0ba28bc619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57d4a6f6b59ea6b4290fc4c59d35ab84.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb18402ba51b697e561e5651f3ee0ae9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
您最近一年使用:0次