如图,
,
的角平分线
交于点F.
(1)求证
;
(2)求证
;
(3)用等式表示线段
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8518c9bd112f86afb26eec99b01934d8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/24/d6993751-e140-409f-a2a2-ca0bd84063ab.png?resizew=140)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a84457121e88c1e39361eda2ac11317.png)
(2)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70ac03e0b1559d3a64fefe22b807f6f2.png)
(3)用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b0967b4f37b81f3c84816cc62145424.png)
更新时间:2023-10-21 21:53:30
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解答题-问答题
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适中
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【推荐1】如图1,在平面直角坐标系中,
是x轴正半轴上一点,
轴,交y轴负半轴于
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/08c833f7-f2bc-464c-9580-197e08bd1554.png?resizew=267)
(1)求C点坐标;
(2)如图2,设D为线段
上一动点,当
时,
的角平分线与
的角平分线的反向延长线交于点P,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b9486ec9dca95979803bf91ca6c337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d21f72aca4a8a9a188aec99dd631d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa6e5a12543f954be1a6057c6b2ed51.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/08c833f7-f2bc-464c-9580-197e08bd1554.png?resizew=267)
(1)求C点坐标;
(2)如图2,设D为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35333abd7f02d663d15251bc5cbbf921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/062c8a3aeb0ff11efde9752e168221d3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42fa5dff377ef08e416547def489def0.png)
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【推荐2】已知直线AB∥CD,直线EF分别交AB、CD于A、C,CM是∠ACD的平分线,CM交AB于H,过A作AG⊥AC交CM于G.
(1)如图1,点G在CH的延长线上时,
①若∠GAB=36°,则∠MCD=______.
②猜想:∠GAB与∠MCD之间的数量关系是______.
(2)如图2,点G在CH上时,(1)②猜想的∠GAB与∠MCD之间的数量关系还成立吗?如果成立,请给出证明;如果不成立,请写出∠GAB与∠MCD之间的数量关系,并说明理由.
(1)如图1,点G在CH的延长线上时,
①若∠GAB=36°,则∠MCD=______.
②猜想:∠GAB与∠MCD之间的数量关系是______.
(2)如图2,点G在CH上时,(1)②猜想的∠GAB与∠MCD之间的数量关系还成立吗?如果成立,请给出证明;如果不成立,请写出∠GAB与∠MCD之间的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2020/3/24/2426500715282432/2427756222791680/STEM/7c45e346d802425ea2ad7e18a4be03cc.png?resizew=382)
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解答题-问答题
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【推荐1】已知材料1:三个内角相等的三角形为等边三角形.
材料2:在同一个三角形中,大角对大边,小角对小边.
结合上述材料,解决下面的问题
如图,
,
,
.点
在线段
上以
的速度由点
向点
运动,同时,点
在线段
上由点
向点
运动.它们运动的时间为
.
(1)若点
的运动速度与点
的运动速度相等,当
时,
与
的大小关系是__________;
的度数是__________.
(2)当
时,设点
的运动速度为
,是否存在实数
,使得
与
全等?若存在,求出相应的
,
的值;若不存在,请说明理由.
材料2:在同一个三角形中,大角对大边,小角对小边.
结合上述材料,解决下面的问题
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df3b2901ad26337818f75e81448ebb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6b2dcfd1fe3e7de1f11a3f08810337.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fb80b591b497d8d7a6d8592160de44.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/cb11a60b-7d3a-4109-bbbf-b95ac229c909.png?resizew=151)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f87c7bb45ab3ace6d77583e00419efd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0fed6f944ef4b07f7e33ca893581fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eac4bf88ef98138fca298444568d947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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名校
【推荐2】已知△ABC为等边三角形,点D为直线BC上一动点(点D不与点B,点C重合).以AD为边作等边三角形ADE,连接CE.
(1)如图1,当点D在边BC上时.
①求证:△ABD≌△ACE;
②直接判断结论BC=DC+CE是否成立(不需证明);
(2)如图2,当点D在边BC的延长线上时,其他条件不变,请写出BC,DC,CE之间存在的数量关系,并写出证明过程.
(1)如图1,当点D在边BC上时.
①求证:△ABD≌△ACE;
②直接判断结论BC=DC+CE是否成立(不需证明);
(2)如图2,当点D在边BC的延长线上时,其他条件不变,请写出BC,DC,CE之间存在的数量关系,并写出证明过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/16/2424ed6e-be16-4536-90c1-7c6828dcd3e7.png?resizew=293)
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【推荐3】如图1,△ACB和△ECD都是等腰直角三角形,∠ACB=∠ECD=90°连结AE、BD.
![](https://img.xkw.com/dksih/QBM/2020/8/10/2524677078540288/2526285502398464/STEM/42d5250d40594cfa84f2aa994f26cf32.png?resizew=94)
(1)线段AE和线段BD的数量关系为 ,位置关系为 ;
(2)如图2,将△ECD绕点C顺时针旋转
(
).
①(1)中的结论是否成立?若成立,利用图2证明;若不成立,说明理由;
② △ECD绕点C顺时针旋转,当点D落在线段AB的中点时,四边形AECD为那种特殊四边?请在图3中画出图形,写出结论,并说明理由;
③△ECD绕点C顺时针旋转,当点E落在线段AB的中点时,四边形ACDE为那种特殊四边?直接写出结论,不用说明理由.
![](https://img.xkw.com/dksih/QBM/2020/8/10/2524677078540288/2526285502398464/STEM/6926251a83a64cdeb3ef9dd7ab233c91.png?resizew=128)
![](https://img.xkw.com/dksih/QBM/2020/8/10/2524677078540288/2526285502398464/STEM/b75a138ae38a46848559175bc21f4d84.png?resizew=145)
![](https://img.xkw.com/dksih/QBM/2020/8/10/2524677078540288/2526285502398464/STEM/34f1edf68df24453b933e8a469e31db4.png?resizew=104)
![](https://img.xkw.com/dksih/QBM/2020/8/10/2524677078540288/2526285502398464/STEM/42d5250d40594cfa84f2aa994f26cf32.png?resizew=94)
(1)线段AE和线段BD的数量关系为 ,位置关系为 ;
(2)如图2,将△ECD绕点C顺时针旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783d872617eed2bbd474035156b6caaf.png)
①(1)中的结论是否成立?若成立,利用图2证明;若不成立,说明理由;
② △ECD绕点C顺时针旋转,当点D落在线段AB的中点时,四边形AECD为那种特殊四边?请在图3中画出图形,写出结论,并说明理由;
③△ECD绕点C顺时针旋转,当点E落在线段AB的中点时,四边形ACDE为那种特殊四边?直接写出结论,不用说明理由.
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【推荐1】如图,在
中,过对角线
的中点O 作直线
,分别交
的延长线,
的延长线于点E ,M,N , F.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5674b1505beabf2b23c44c2be3d95c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28f19076caacef10c04950f551595b51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
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【推荐2】如图,是
的直径,C是
上一点,过点C作
的切线交
的延长线于点D,延长
至点E,使得
,过点C作
于点F.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5427b7b994b860628df3d6b7a07de8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc5df62e8ac9c74a46462519b95479a.png)
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