如图1,四边形
是正方形,点
是
边上任意一点,
于点
,
且交
于点
.
;
(2)如图2,连接
,探究线段
与
的关系并证明;
(3)图1中,若
,求
长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd99874843902d155f3f9dc26b924f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3255ac1b6f934fcb4aa742a81bd8aef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab730b80137d4e96cf6526f3b100cfc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)图1中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d19e2f709727ed22835304640b93db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
更新时间:2016-12-06 02:54:46
|
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解答题-问答题
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【推荐1】(1)唐朝诗人李顾的诗
古从军行
开头两句:“白日登山望烽火,黄昏饮马傍交河”,诗中隐含着一个有趣的数学问题:如图
所示,诗中大意是将军从山脚下的
点出发,带着马走到河边
点饮水后,再回到
点宿营,请问将军怎样走才能使总路程最短?请你通过画图,在图中找出
点,使
的值最小,不说明理由;
,如图
,点
为
内一点,请在射线
、
上分别找到两点
、
,使
的周长最小,不说明理由;
:如图
,在
中,
,
,
,
,
平分
,
、
分别是
、
边上的动点,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b0e787c1d82071c825975348698f58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/461950348087cdb06ec28d7569d14c1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13ec9a812274ad0839f20ba17348687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.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/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f374414357b609bc2a5fa5725ab82f11.png)
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解答题-证明题
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解题方法
【推荐2】如图,△ABC中,
,AD是BC边上的高,如果
,我们就称△ABC为“高和三角形”.请你依据这一定义回答问题:
(1)若
,
,则△ABC____ “高和三角形”(填“是”或“不是”);
(2)一般地,如果△ABC是“高和三角形”,则
与
之间的关系是____,并证明你的结论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595fe735f6ad7057c7434707df895d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89e3e03158b56e714b771115443660d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
(2)一般地,如果△ABC是“高和三角形”,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://img.xkw.com/dksih/QBM/2019/5/19/2207159955988480/2271244627419136/STEM/da3245b3a07c49459a64ab780cced90b.png?resizew=210)
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【推荐1】点A是反比例函数
图像上一点,点B、A关于原点对称,C为图像上另一点(点C在点A左侧).
(1)若点A的坐标是(2,1),
①求反比例函数关系式;
②若△OAC的面积等于
,求点C的坐标;
(2)设点A、C的横坐标分别为m、n,若∠ACB=90°,求证:mn=k.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03517310ea1e913f709753592ac65ffd.png)
(1)若点A的坐标是(2,1),
①求反比例函数关系式;
②若△OAC的面积等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
(2)设点A、C的横坐标分别为m、n,若∠ACB=90°,求证:mn=k.
![](https://img.xkw.com/dksih/QBM/2021/9/21/2812480951492608/2814930307014656/STEM/05695c6981444b60bf007d0e60139d18.png?resizew=327)
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【推荐2】已知:如图,在△ABC中,AB=BC=3cm,延长BA至点D,使DA=AB,连接DC,若∠DAC=120°,求:DC的长度.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/71169410-13c1-4640-a201-a388db2b4938.png?resizew=174)
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【推荐1】如图,在正方形ABCD中,点E,F分别在边AD,CD上,
![](https://img.xkw.com/dksih/QBM/2019/4/9/2178583313440768/2179515196735488/STEM/21596289656f4e389c5fdb1ca92b2db6.png?resizew=430)
(1)若AB=6,AE=CF,点E为AD的中点,连接AE,BF.
①如图1,求证:BE=BF=3
;
②如图2,连接AC,分别交AE,BF于M,M,连接DM,DN,求四边形BMDN的面积.
(2)如图3,过点D作DH⊥BE,垂足为H,连接CH,若∠DCH=22.5°,则
的值为 (直接写出结果).
![](https://img.xkw.com/dksih/QBM/2019/4/9/2178583313440768/2179515196735488/STEM/21596289656f4e389c5fdb1ca92b2db6.png?resizew=430)
(1)若AB=6,AE=CF,点E为AD的中点,连接AE,BF.
①如图1,求证:BE=BF=3
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
②如图2,连接AC,分别交AE,BF于M,M,连接DM,DN,求四边形BMDN的面积.
(2)如图3,过点D作DH⊥BE,垂足为H,连接CH,若∠DCH=22.5°,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/956c4a03127f33e7fb7acc3476f717ce.png)
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解题方法
【推荐2】四边形
是正方形,将线段
绕点C逆时针旋转
,得到线段
,连接
,过点B作
交
的延长线于F,连接
.
(2)直接写出
的度数:
(3)连接
,用等式表示线段
与
的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5dcd602f70e8a8f6246647e551b546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7a3dc3f3a02f4400e22dec2f2fee23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d3f19ab76b27b47aeaaf4a66f0e580b.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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