在正方形ABCD中,P是射线CB上的一个动点,过点C作
于点E,射线CE交直线AB于点F,连接BE.
①求证:
;
②求证:
;
(2)如图2,当点P在线段CB的延长线上时(
),依题意补全图2并用等式表示线段EA,EC,EB之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4398a409532d9a2a7504f91c5be1b93.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deebefa9afcded2e69ec2f8a2e99e2a1.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc29dbc657d6dbdaffa7209a9f6a3570.png)
(2)如图2,当点P在线段CB的延长线上时(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b37c7394f10c3eb06cab2537502ddd8.png)
更新时间:2022-07-16 18:24:31
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】在课外兴趣小组活动时,刘老师给出了如下问题:
如图1,已知四边形
中,
平分
,
,
与
互补,求证:
.
小敏反复探索,不得其解.她想,若将四边形
特殊化,看如何解决该问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/5258c2e1-87e1-4c49-8415-4465cfe5af5b.png?resizew=250)
(1)从特殊情况入手,添加条件“
”,如图2,可证:
.请你完成此证明;
(2)类比(1)中问题的解决方法,利用图1证明
.
如图1,已知四边形
![](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/4189a0821a0ffab9dc171ecd279ba442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3202207f1d3c2ca29228647b7ddebe.png)
小敏反复探索,不得其解.她想,若将四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/5258c2e1-87e1-4c49-8415-4465cfe5af5b.png?resizew=250)
(1)从特殊情况入手,添加条件“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3202207f1d3c2ca29228647b7ddebe.png)
(2)类比(1)中问题的解决方法,利用图1证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3202207f1d3c2ca29228647b7ddebe.png)
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【推荐2】已知直线
,
的平分线与
的平分线交于点C,过点C作
交
于点D,交直线
于点E.
时,如图①,易证:
;当直线
与
不垂直时,如图②、图③,猜想线段
之间有怎样的数量关系,请写出你的猜想,并利用图②或图③进行证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d7dc7451e667ad77a26e75ce11e709e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d73b2448f9aba5ca9885fd1edd1bca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eefb9a7a779b6c8d21187ee751c420a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f6b5026f0d684bf35cc3237bcd3ae2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/518ae8dc74b5d4883b167b94c191d542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce131f85bf2a88568aae9b2cf25a3ba3.png)
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【推荐1】如图,
中,
,
,
在边
上,延长
,
与
的外接圆分别交于
,
两点.
(2)若
,
,
,求弦
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e19b77c15bdff64b03a92cac5e7598eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070bc896d35495237fd65576e9b6f88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a9359141eaf878cd0813e2ddb7330f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
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名校
【推荐2】如图①,在平面直角坐标系中,
,
,
,其中m、n满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/946b1898-afe3-4c2e-a1d5-5c2df978bbe4.png?resizew=229)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/2c6fa91c-c60e-4908-9c8d-8537401a0091.png?resizew=179)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/f99f2dbb-aeb3-4739-9850-1db748d260d5.png?resizew=186)
(1)直接写出
的形状;
(2)如图②,设点D是线段OB上一点,过点O作
于E,过点B作
于F.
(ⅰ)求证:
;
(ⅱ)如图③,延长BF交OA于点M,若BM平分
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b62194097ac66a5093c57fca2f5b4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dcd07282c464cde7de6b6ed522e233e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c406bd4f662c1cf101c40b1ccf9a4e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5087c955224378da6f3df6ceaabf0b03.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/946b1898-afe3-4c2e-a1d5-5c2df978bbe4.png?resizew=229)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/2c6fa91c-c60e-4908-9c8d-8537401a0091.png?resizew=179)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/f99f2dbb-aeb3-4739-9850-1db748d260d5.png?resizew=186)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
(2)如图②,设点D是线段OB上一点,过点O作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e94633285fd100c13a7cd4d13fad631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b9d0c688e55286443c9974797fc647f.png)
(ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0760ef08b272491d9e24b79e1060fa9a.png)
(ⅱ)如图③,延长BF交OA于点M,若BM平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22f9341d51c827a29a4a0b0b3dded16c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eba2397c25e272f22515594b5cd00e37.png)
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【推荐1】如图,在三角形ABC中,AB=10,BC=12,AD为BC边上的中线,且AD=8,过点D作DE⊥AC于点E.
(1)求证:AD⊥BC;
(2)求DE的长.
(1)求证:AD⊥BC;
(2)求DE的长.
![](https://img.xkw.com/dksih/QBM/2021/10/13/2828199803338752/2831419384881152/STEM/08b3bf80-2aef-4c82-bab0-2fb5ee66da19.png)
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适中
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【推荐2】如图, 在
中,
, 点D为
中点, E、F分别为边
、
上两点, 且
,
;
(2)若
,
, 求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a0461fafad96eacf73eff85e8ef98fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3de3e04e5acc1a3e6ef5199f555e73ac.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6646ce303f0eb1f35e20228fc9e197a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c39e22f3eda6e52e6461fb8b548d464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】(1)如图1,在正方形
中,E是对角线
上的一点,连接
,过点E作
交
于F.求证:
.
(2)如图2,在矩形
中,
,E是对角线
上的一点,连接
,过点E作
交
于点F.若
,求
的值.
(3)在菱形
中,如图3,
,点E是
的三等分点,过点E作
交直线
于点F.请直接写出线段
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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3a3137299ffaea0545cd45323f1af2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2e1083b773e16d1e385072652f7319.png)
(2)如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c174743f61c6a0952fc836a2dd5bcf5b.png)
![](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/bc3a3137299ffaea0545cd45323f1af2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4039762c2e2a8f6b2115eeedb34d50c1.png)
(3)在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4feb4e41611ab00c6e7c85553949f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3a3137299ffaea0545cd45323f1af2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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解答题-证明题
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适中
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【推荐2】如图,四边形
为正方形,点
在
上,
,
,垂足分别为
,
.
(1)求证:
;
(2)
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/082292e52d5b734762cf9c139ee550bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c324719d030498f53a2f1353b643f83b.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783a833992e0862211a15fec2d3e3dda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689b95a2eeb841dd3a0a3a6dfa3be8fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/fc3f87f5-44eb-4453-b092-888806b35c21.png?resizew=125)
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