题型:解答题
难度:0.65
引用次数:109
题号:17903335
如图,
是
的切线,切点为A,
是
的直径,连接
交
于E.过A点作
于点D,交
于B,连接
,
.
![](https://img.xkw.com/dksih/QBM/2023/1/15/3153178131079168/3154561169645568/STEM/5ec05e021e1c4888b1f82a02f2c975c5.png?resizew=208)
(1)求证:
是
的切线;
(2)求证:E为
的内心;
(3)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74d4d587b12f0c7714838330b2b84ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/2023/1/15/3153178131079168/3154561169645568/STEM/5ec05e021e1c4888b1f82a02f2c975c5.png?resizew=208)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求证:E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a362daefde38d28a6b973c872c703866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
更新时间:2023-01-17 07:54:02
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知
是边长为8cm(可求得高为
)的等边三角形,边
在射线
上,且
,点D从O点出发,沿
的方向以
的速度运动,当D不与点A重合时,以
为边作等边三角形
,连接
.
(1)证明:
;
(2)如图2,当
时,求
的周长的最小值;
(3)当点D在射线
上运动(即
)时,是否存在以D、E、B为顶点的三角形是直角三角形?若存在,求出此时t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a8273cfc2494403de8d04d64ca9cceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a33cdf2f57ef86e955c2176c70b0748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4bf2ed4e49655ce765ba6ffbb6c7d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/19/b10482b5-5d08-4cf7-be58-31e2584d35cd.png?resizew=592)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4fb7fcbcd3f3f60c043c832d7ded63d.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeead016b405f69e28e8da35a3ffc7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2281cb6df0c3c518ce5ed19a02b57e.png)
(3)当点D在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c81b29ac8a01886b25dcef55c5f6877.png)
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名校
【推荐2】如图1,点
、
分别是边长为5cm的等边
边
、
上的动点,点
从顶点
,点
从顶点
同时出发,且它们的速度都为1cm/s.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/93ae9a7d-3baf-4325-9a65-cdfc9d871bff.png?resizew=134)
(1)连接
、
交于点
,则在
、
运动的过程中,
变化吗?若变化,则说明理由,若不变,则求出它的度数;
(2)何时
是直角三角形,求
的值?
(3)如图2,若点
、
在运动到终点后继续在射线
、
上运动,直线
、
交点为
,则
变化吗?若变化,则说明理由,若不变,直接写出它的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/93ae9a7d-3baf-4325-9a65-cdfc9d871bff.png?resizew=134)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9baba5742fe32111ddd8a76fd5b265.png)
(2)何时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9baba5742fe32111ddd8a76fd5b265.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/4fc93e1b-3f34-4c67-ad49-b39e3a1142c7.png?resizew=223)
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【推荐1】如图,在△ABC中,AB=AC,以AB为直径的⊙O分别与BC,AC交于点D,E,过点D作DF⊥AC,垂足为点F.
![](https://img.xkw.com/dksih/QBM/2022/2/10/2913309723590656/2924695407411200/STEM/e70614efeea84d95896ad586bca028c9.png?resizew=153)
(1)求证:直线DF是⊙O的切线;
(2)求证:BD2=CF•AC.
![](https://img.xkw.com/dksih/QBM/2022/2/10/2913309723590656/2924695407411200/STEM/e70614efeea84d95896ad586bca028c9.png?resizew=153)
(1)求证:直线DF是⊙O的切线;
(2)求证:BD2=CF•AC.
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真题
名校
【推荐2】如图,
是
的直径,点C是
上异于A、B的点,连接
、
,点D在
的延长线上,且
,点E在
的延长线上,且
.
是
的切线:
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbfe82da71061712d34302df5b31f4c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c38bbe49284a2ceab26001ced8cfd56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c7442dae1a747f5e6b72864d2ef829e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
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【推荐1】如图,BF和CE分别是钝角△ABC(∠ABC是钝角)中AC、AB边上的中线,又BF⊥CE,垂足是G,过点G作GH⊥BC,垂足为H.
(1)求证:GH2=BH•CH;
(2)若BC=20,并且点G到BC的距离是6,则AB的长为多少?
(1)求证:GH2=BH•CH;
(2)若BC=20,并且点G到BC的距离是6,则AB的长为多少?
![](https://img.xkw.com/dksih/QBM/2018/11/1/2065940923416576/2067187959169024/STEM/2f8f6c4ddf674ae2bb8e400f3fc86850.png?resizew=189)
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【推荐2】如图(1),已知:在菱形
中,点
,
分别在边
,
上,
,
,
分别交
于点
,
.
.
(2)连接
,如图(2),当
时,
①求证:
;
②求
的值.
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b508a5e7684503c6eb0e42d9c2b49983.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2140f0f750d12f2c7e8591304f902f7.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01530819a3e0195c5da9c13cbbcdddbc.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08341fa8b1827c032f796e5f88941b78.png)
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【推荐1】如图,在△ABC中,∠ACB=90°,AB=10,BC=6,点D在AB的延长线上,且BD=6,过点D作DE⊥AD交AC的延长线于点E,以DE为直径的⊙O交AE于点F.
(1)求⊙O的半径;
(2)设CD交⊙O于点Q,①试说明Q为CD的中点;②求
的值.
(1)求⊙O的半径;
(2)设CD交⊙O于点Q,①试说明Q为CD的中点;②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdcd8453cde3912663f11147f30d966b.png)
![](https://img.xkw.com/dksih/QBM/2018/11/15/2076013374865408/2076888234409984/STEM/8533fdfd7092426e8f5a49397e9df101.png?resizew=113)
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解题方法
【推荐2】如图,在
中,
为直径,点
、
都在
上,且
平分
,过点
作
,交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/2020/5/24/2469690927423488/2470563189538816/STEM/0d1d5ab5a05a4258b6cd2c34501396e1.png?resizew=144)
(1)求证:
是
的切线;
(2)若
,
,求
的直径.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.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://img.xkw.com/dksih/QBM/2020/5/24/2469690927423488/2470563189538816/STEM/0d1d5ab5a05a4258b6cd2c34501396e1.png?resizew=144)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐3】阅读与思考:阿基米德(公元前287年-公元前212年),伟大的古希腊哲学家、百科式科学家、数学家、物理学家、力学家、静态力学和流体静力学的奠基人,并且享有“力学之父”的美称,留给后人的最有价值的书是《阿基米德全集》.在该书的“引理集”中有这样一道题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/18/4a8ad81a-74a4-4f0f-86db-8db7e4820135.png?resizew=443)
如图1,以
为直径作半圆O,弦
是一个内接正五边形的一条边(即:
),点D是
的中点,连接
并延长与直径
的延长线交于点E,连接
交于点F,过点F作
于点M.求证:
是半圆的半径.
下面是勤奋小组的部分证明过程:
证明:如图2,过点D作
于点H.
∵
,
∴
.(依据1)
∵点D是
的中点,
∴
.
∵
,
∴
.
∴
.(依据2)
∵以
为直径作半圆O,
∴
.(依据3)
∴
.
∵四边形
是半圆O的内接四边形,
∴
.(依据4)
∵
,
∴
.
∵
于点M,
∴
.
∵
,
∴
.
∵
.
∵
.
∴
.
∴
.
……
通过上面的阅读,完成下列任务:
(1)任务一:直接写出依据1,依据2,依据3和依据4;
(2)任务二:根据勤奋小组的解答过程完成该题的证明过程.(提示:先求出
的度数,再根据等腰三角形的性质或判定完成该题的证明过程)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/18/4a8ad81a-74a4-4f0f-86db-8db7e4820135.png?resizew=443)
如图1,以
![](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/966e5c0edb757b2f221491913b5bf0a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f40340d3b1d7eba8ca69b28227ade8d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cc74d5754eeb269bcdc63c78a26692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
下面是勤奋小组的部分证明过程:
证明:如图2,过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a7cf70f8772d8fea4599b18df2c88f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8be5e30d4ab7906bd002a1d2775c3795.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/553124faad9a524110fc6efb9484b93c.png)
∵点D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/207f9370c78c131304f8be7b457d268a.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966e5c0edb757b2f221491913b5bf0a7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ac3631287a0434a6209c35d098480a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbca06df2271b1ee2e7b08a85f5a5c01.png)
∵以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8790a77bc3cbd12eb4c6eda8ead03a30.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a42b69533b1ea52da3a5af6ae9fe6e70.png)
∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc8b0ad395ee73b5a7b7d96f794a85c8.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ad2180053eb72b03b65bb6d3512192.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ebf1d0f78b5806620a9305ef7b54f2b.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cc74d5754eeb269bcdc63c78a26692.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a00d64f99bb32b2d6ba4e5da37badb.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cbaab33d387d2ad8d5e0f983d7fbbf8.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d99e9f38670db9dedf47c98720c15c5d.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7370aad3512a869830f1024c2061ef8a.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f40e4c8962905e6b11d6150f598feb01.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d55ae9905df3c411e6a02ce76d0d27a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a386524e1e2a7bc2754052f780cd275a.png)
……
通过上面的阅读,完成下列任务:
(1)任务一:直接写出依据1,依据2,依据3和依据4;
(2)任务二:根据勤奋小组的解答过程完成该题的证明过程.(提示:先求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
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