在
中,
,D是斜边
的中点,E是
边上一动点,连接
,当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bad6723f723b7176e7b567634050d01.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/488c65067ebfe6cfbcf006f0be431518.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd32d2db65c6c30f0981cf6b21ab94bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/28/c56d6a47-d408-47ce-b995-32b57e28a96d.png?resizew=159)
2021九年级·全国·专题练习 查看更多[1]
(已下线)(专题)相似三角形的常见辅助线
更新时间:2021-07-30 20:05:40
|
相似题推荐
解答题-证明题
|
较难
(0.4)
名校
【推荐1】如图,在四边形
中,
,
是对角线
的中点,连接
并延长交边
或边
于点
.
(1)当点
在
上,
①求证:
;
②若
,求
的值;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7497d3fc898962fd5ee0682539baa2ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/e8eefa53-52ea-4f64-bb87-1122761ed9ac.png?resizew=145)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01cae309406ea3e26340d5ec7f849b2b.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b937442ad4cc480adc11bb143559454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606ff826406d9fc8403d365762cd9e4c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1da85f45e9f5e52a57e06727c8b0a63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐2】如图,在平面直角坐标系中,已知直线
与直线
相交于点
。
![](https://img.xkw.com/dksih/QBM/2019/12/30/2366147512426496/2367103568150528/STEM/7df3b6b3cf8049a2a8d7c128ee9b8905.png?resizew=298)
(1)求点
的坐标;
(2)点
是
内部一点,连接
,求
的最小值;
(3)将点
向下平移一个单位得到点
,连接
,将
绕点
旋转至
的位置,使
轴,再将
沿
轴上下平移得到
,在平移过程中,直线
与
轴交于点
,在直线
上任取一点
,连接
,
,
能否以
为直线边构成等腰直角三角形?若能,请直接写出所有符合条件的
点的坐标,若不能,请说明理由。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb7cc19236bf046143c787674363d11a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c68b443e9443d5194a206f321ec67dc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/2019/12/30/2366147512426496/2367103568150528/STEM/7df3b6b3cf8049a2a8d7c128ee9b8905.png?resizew=298)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c7267e5313b9b00ef22c94a479fc34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28583843aa8c06a4ec3a7e90489ced94.png)
(3)将点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58a33e4f7ad1efdbd7d111090f8ef79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e568f9910252b0b230a4235095bb12a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca54ff0ce454b9a91c7c05247435786.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e568f9910252b0b230a4235095bb12a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/859008f370c07cded0966027aad30c0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c43f25751ac9c9614b26ca30dd9c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b23d2c83da2b36d6df8fd2340aa9d08d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5529046d232de846352a439d991439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d6295224d0c12333931cf8b9a5474a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a36fbd4d9973be66c71311018b4777d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6822eb9bee42b219a1a5cfae5bbee381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
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解答题-问答题
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名校
【推荐1】综合与探究
问题提出
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/93cd1ff9-4f2e-4ec0-813a-8b2baed7dc0d.png?resizew=461)
方法探究
(1)对不规则图形求面积,主要有两种方法:“分割”和“补全”.图2利用分割的方法,图3利用补全的方法,都顺利求出了梯形
的面积,则梯形
的面积为________.
方法应用
(2)①如图4,直线
,直线
,直线
两两相交,
、
、
为交点,求
的面积.
②如图5,在
中,
于点
,
,
,
直接写出
的长.(提示:有三个角是直角的四边形是长方形,且长方形的对边相等)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/c91db97c-222c-4c05-94f6-beba2652ecf6.png?resizew=164)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/a1c9bd47-b680-4c4f-a542-9e4bd852a368.png?resizew=118)
问题提出
做一做 如图1,图中小正方形的边长均为1个单位长度,试求图中梯形 ![]() |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/93cd1ff9-4f2e-4ec0-813a-8b2baed7dc0d.png?resizew=461)
方法探究
(1)对不规则图形求面积,主要有两种方法:“分割”和“补全”.图2利用分割的方法,图3利用补全的方法,都顺利求出了梯形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
方法应用
(2)①如图4,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d68f84e0b899b45fc0f6ef15ed99731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3618fcd13452235077c5b5f6a2561f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4430d956300509a71f6f6af1f17576fb.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
②如图5,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bdf82f2b3ac77ee7b9b35aebe0dd83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/c91db97c-222c-4c05-94f6-beba2652ecf6.png?resizew=164)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/a1c9bd47-b680-4c4f-a542-9e4bd852a368.png?resizew=118)
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【推荐2】如图
,在
中,
,
,
,点
为边
的中点.动点
从点
出发,沿折线
向终点
运动,点
在
边上以每秒
个单位长度的速度运动,在
边上以每秒
个单位长度的速度运动,在点
运动的过程中,过点
作
的平行线,过点
作
的平行线,两条平行线相交于点
、点
不与点
、点
重合,设点
的运动时间为
秒.
(1)
______ .
(2)用含
的代数式直接表示
的长.
(3)当四边形
是轴对称图形时,求出
的值.
(4)连接
,如图
,当
将
的面积分成
两部分时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc0d8c4e945e4230252a7b4c97d39ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/22/1999c721-dc81-4ccd-b530-b1b9af942bb7.png?resizew=242)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f20744b52b3ead19a94d0d4a5ed835.png)
(2)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(3)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ba6d444f8e55d0ec7ef40324d2c7f27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(4)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题-问答题
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名校
解题方法
【推荐1】如图,在等边
边长为6,O是中心;在
中,
,
,
.将
绕点A按顺时针方向旋转一周.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/18/1f94ed3c-a398-4dd6-bbe2-b8768ad4840a.png?resizew=524)
(1)当
、
分别在
、
边上,连结
、
,求
的面积;
(2)设
所在直线与
的边
或
交于点F,当O、D、E三点在一条直线上,求
的长;
(3)连结
,取
中点M,连结
,
的取值范围为_________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d110261e49b946b3e859ad0a8ba48a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb64353c99068a7a1a8508a22f5b25b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6755c22391da52774be5606fb0a919ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/18/1f94ed3c-a398-4dd6-bbe2-b8768ad4840a.png?resizew=524)
(1)当
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e00bf73d03dded1cf5f83cc5339361.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/6aa2b5e09f8ec785c59900a529390a02.png)
(3)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
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名校
【推荐2】如图,
中,
,
,以点A为圆心、
长为半径作弧,再以点B为圆心,
长为半径作弧,与前弧交于点D,连接
,交
于点E,连接
.
(1)猜想:如图1,写出线段
与
的数量关系是______,直线
与直线
所夹的锐角是______;
(2)探究:如图2,将
绕点B逆时针方向旋转α,在旋转过程中,(1)中的
与
的数量关系是否仍然成立,若成立,给出证明;若不成立,请说明理由.
(3)拓展:在(2)的条件下,若
,当D、E、A共线时,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce7f6d278f2ef7a193b7eed7be6b3c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27557ad8d2618454755309fad45cb69e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4c2fa66f795c9097a09ed3e5e46118b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/27/1918d143-3edf-4aef-b8c0-af1cc73f55a0.png?resizew=406)
(1)猜想:如图1,写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
(2)探究:如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82fe5c73d09889ebd16037f4779a1046.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
(3)拓展:在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc9f0779b0ba2f9f97caf35c166ad24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
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【推荐1】如图,在正方形
中,
,点P、Q分别是
、
边上的动点.
![](https://img.xkw.com/dksih/QBM/2023/1/4/3145407257403392/3147068908929024/STEM/773b3f54307e42a3b87884a1123843ea.png?resizew=174)
![](https://img.xkw.com/dksih/QBM/2023/1/4/3145407257403392/3147068908929024/STEM/5d83bf2244594eb8b7e35ba73ebfa50b.png?resizew=173)
(1)填空:
_________;
(2)若
,且点A关于
的对称点
落在
边上,求
的值;
(3)设
,直线
交直线
于点
,求
与
面积之和
的最小值.(用含a的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2023/1/4/3145407257403392/3147068908929024/STEM/773b3f54307e42a3b87884a1123843ea.png?resizew=174)
![](https://img.xkw.com/dksih/QBM/2023/1/4/3145407257403392/3147068908929024/STEM/5d83bf2244594eb8b7e35ba73ebfa50b.png?resizew=173)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8707ab6dd4e67b48f264f71bba7c507.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b7822bd5f036c0ea6802ca7f62e2d9e.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a93b9e58955cd81f6d2444a284c58be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ed8572d4c24350d8de87f814ba2b9ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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【推荐2】对于平面直角坐标系中的两条直线,给出如下定义:若不平行的两条直线与x轴相交所成的锐角相等,则称这两条直线为“等腰三角线”.如图1中,若
,则直线
与直线
称为“等腰三角线”;反之,若直线
与直线
为“等腰三角线”,则
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/d8862915-3ab7-42be-8d54-e949737e416a.png?resizew=327)
(1)如图1,若直线
与直线
为“等腰三角线”,且点P、Q的坐标分别为
、
,求直线
的解析式;
(2)如图2,直线
与双曲线
交于点A、B,点C是双曲线
上的一个动点,点A、C的横坐标分别为m、n(
),直线
分别与x轴于点D、E;
①求证:直线
与直线
为“等腰三角线”;
②过点D作x轴的垂线l,在直线l上存在一点F,连接EF,当
时,求出线段
的值(用含n的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a33e5578085341d69ade6aad0c6ff1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f97913e1af1e6c793f7edfe6b2114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f97913e1af1e6c793f7edfe6b2114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a33e5578085341d69ade6aad0c6ff1d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/d8862915-3ab7-42be-8d54-e949737e416a.png?resizew=327)
(1)如图1,若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f97913e1af1e6c793f7edfe6b2114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663d94efcc8a8a4b5a3563e94eb8fbb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcbcd0aebdd8bd688d108834747009f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f97913e1af1e6c793f7edfe6b2114.png)
(2)如图2,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c914e2321e28c2c268e90354db0bf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b60143ef7bdfa6f4541de251406c10bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1005d9def461d00556e3aced70ea2f0b.png)
①求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
②过点D作x轴的垂线l,在直线l上存在一点F,连接EF,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7090800a960f36016a0a6efe78b22d0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3999ca5f7191d7416bb5c2d0e261688c.png)
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