在
中,
,
是平面内一点,
,点
在
边所在直线上,
,垂足是
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/aef3f1b2-f93a-40a5-b8cb-03c78fa130f2.png?resizew=457)
(1)当点
在线段
上时,如图①,求证:
;
(2)当点
在线段
延长线上时,如图②;当点
在线段
延长线上时,如图③,请猜想并直接写出线段
,
,
的数量关系;
(3)如图③,若
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dfeaa1835689c47033f9fc21461660c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7b5ea5627440c19999a9039eaa1c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/aef3f1b2-f93a-40a5-b8cb-03c78fa130f2.png?resizew=457)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360f6356c601f74aa78970793ef60056.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)如图③,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fa61506c1f14478d5d07baff1016dc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c999d6e2a84f345b40c12065530b68eb.png)
更新时间:2024-03-15 21:21:36
|
相似题推荐
解答题-证明题
|
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名校
【推荐1】如图,∠BAD=∠CAE=90°,AB=AD,AE=AC,AF⊥CB,垂足为F.
(2)求∠FAE的度数;
(3)求证:CD=2BF+DE.
(2)求∠FAE的度数;
(3)求证:CD=2BF+DE.
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【推荐2】如图,
是等腰三角形,
,
是
上一点,过点
作
交
于点
,交
的延长线于点
.
(1)求证:
是等腰三角形;
(2)若
,
,
,求
的长.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/3/e98db25a-85f0-46f7-bd49-585b2475e618.png?resizew=223)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2594e927cb7ed022acc039c3bb136d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc848db282db12957acad1e0983d2705.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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解答题-证明题
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适中
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【推荐1】八年级数学课上,老师出示了如下框中的题目.
![](https://img.xkw.com/dksih/QBM/2019/1/26/2127282505703424/2129964607201280/STEM/dbfdd9135eeb47f687030579faaeb8b9.png?resizew=388)
小华与同桌小明讨论后,进行了如下解答:
(1)特殊情况入手探索:
当点E为AB的中点时,如图1,确定线段AE与DB的大小关系.请你直接写出结论:AE_____DB(填“>”,“<”或“=”).
![](https://img.xkw.com/dksih/QBM/2019/1/26/2127282505703424/2129964607201280/STEM/e5dd68afdd024e788cfed7ab349d6189.png?resizew=158)
(2)一般情况进行论证:
对原题中的一般情形,二人讨论后得出(1)中的结论仍然成立,并且可以通过构造一个三角形与△EBD全等来证明.以下是他们的部分证明过程:
证明:如图2,过点E作EF∥BC,交AC于点F.(请完成余下的证明过程)
![](https://img.xkw.com/dksih/QBM/2019/1/26/2127282505703424/2129964607201280/STEM/64653037db944bd68dff3853fe8586a2.png?resizew=146)
(3)应用结论解决问题:
在边长为3的等边三角形ABC中,点E在直线 AB上,且AE=1,点D在直线 BC上,ED=EC.则EC=_____(直接写出结果).
![](https://img.xkw.com/dksih/QBM/2019/1/26/2127282505703424/2129964607201280/STEM/8c7cb6d138af4450869e006b075c85ef.png?resizew=109)
![](https://img.xkw.com/dksih/QBM/2019/1/26/2127282505703424/2129964607201280/STEM/dbfdd9135eeb47f687030579faaeb8b9.png?resizew=388)
小华与同桌小明讨论后,进行了如下解答:
(1)特殊情况入手探索:
当点E为AB的中点时,如图1,确定线段AE与DB的大小关系.请你直接写出结论:AE_____DB(填“>”,“<”或“=”).
![](https://img.xkw.com/dksih/QBM/2019/1/26/2127282505703424/2129964607201280/STEM/e5dd68afdd024e788cfed7ab349d6189.png?resizew=158)
(2)一般情况进行论证:
对原题中的一般情形,二人讨论后得出(1)中的结论仍然成立,并且可以通过构造一个三角形与△EBD全等来证明.以下是他们的部分证明过程:
证明:如图2,过点E作EF∥BC,交AC于点F.(请完成余下的证明过程)
![](https://img.xkw.com/dksih/QBM/2019/1/26/2127282505703424/2129964607201280/STEM/64653037db944bd68dff3853fe8586a2.png?resizew=146)
(3)应用结论解决问题:
在边长为3的等边三角形ABC中,点E在
![](https://img.xkw.com/dksih/QBM/2019/1/26/2127282505703424/2129964607201280/STEM/8c7cb6d138af4450869e006b075c85ef.png?resizew=109)
![](https://img.xkw.com/dksih/QBM/2019/1/26/2127282505703424/2129964607201280/STEM/46de1f8598fe408284c7bbac303ae3d3.png?resizew=109)
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【推荐2】如图,已知:D是
的边
上一点,点E在
外部,且
,
,
交
于点F.
;
(2)如果
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02fbbe04651b37e1520bb9a7bafed509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b83920252e1687dd96a277e51bbaaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4e363bfd418579e6229230df034bbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/317189cf6949b90b17e49ec66061b8d8.png)
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解答题-证明题
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适中
(0.65)
【推荐1】已知点
到
的两边
、
所在直线的距离相等,且
.
(1)如图1,若点
在
上,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/ea98bb25-cc58-4579-be90-b5edacbd8067.png?resizew=125)
(2)如图2,若点
在
的内部,(1)中结论是否成立?若成立,请说明理由;若不成立,请写出正确结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/49c8dbc31b2e14067ef2f34b4e25f114.png)
(1)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/ea98bb25-cc58-4579-be90-b5edacbd8067.png?resizew=125)
(2)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/eab004cd-2e34-43aa-aa1a-5ee87b23ff30.png?resizew=136)
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解答题-证明题
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【推荐2】如图,在
中,
,点
在斜边
上,以O为圆心,
为半径作
,分别与
,
相交于点D,E,连接
,若
恰好与
切于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/22/cc2c9358-aa7b-4a01-921d-4d99d0fcbe3e.png?resizew=143)
(1)求证:
;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76899b3a0bfbbdae7cb1148ad4bf018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/22/cc2c9358-aa7b-4a01-921d-4d99d0fcbe3e.png?resizew=143)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52de4d92b1a1da7a954065066e7e7303.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/620fd368efb51a5ae90c0f3e276704d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,在四边形ABCD中,AB=3,AD=4,BC=13,CD=12,且∠A=900,
(1)求BD的长
(2)求∠BDC的度数
(3)求四边形ABCD的面积.
(1)求BD的长
(2)求∠BDC的度数
(3)求四边形ABCD的面积.
![](https://img.xkw.com/dksih/QBM/2020/6/30/2495465419956224/2495871938961408/STEM/9c612641bcee4757bb747a3658a543f1.png?resizew=144)
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