【问题背景】(1)小明在学习多边形时,把如图1的图形看成为“8”字形,并得出如下结论:∠A+∠B=∠C+∠D,请你说明理由;
(2)【尝试应用】如图2,AP、CP分别平分∠BAD、∠BCD,若∠ABC=36°,∠ADC=16°,求∠P的度数;
![](https://img.xkw.com/dksih/QBM/2021/9/23/2814457787744256/2815108521115648/STEM/8b5740046777408a87166880643a4e10.png?resizew=444)
小明结合(1)中的结论并利用方程思想轻松解答如下:
解:由AP、CP分别平分∠BAD、∠BCD,可设∠1=∠2=x,∠3=∠4=y,
由(1)的结论得:
,…………请你帮小明把求解过程补充完整.
(3)【拓展延伸】如图3,已知∠C=α,∠B=β,∠CAP=
∠CAB,∠CDP=
∠CDB,请利用上述结论或方法直接写出∠P的度数.(用含α,β 的代数式表示)
(2)【尝试应用】如图2,AP、CP分别平分∠BAD、∠BCD,若∠ABC=36°,∠ADC=16°,求∠P的度数;
![](https://img.xkw.com/dksih/QBM/2021/9/23/2814457787744256/2815108521115648/STEM/8b5740046777408a87166880643a4e10.png?resizew=444)
小明结合(1)中的结论并利用方程思想轻松解答如下:
解:由AP、CP分别平分∠BAD、∠BCD,可设∠1=∠2=x,∠3=∠4=y,
由(1)的结论得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1038487d8ae65139a5f00090b370d543.png)
(3)【拓展延伸】如图3,已知∠C=α,∠B=β,∠CAP=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
20-21七年级下·河南南阳·期末 查看更多[2]
更新时间:2021-09-24 17:35:51
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相似题推荐
解答题-作图题
|
适中
(0.65)
【推荐1】数学课上,李老师出示了如下题目.
将一副三角板按如图1所示方式摆放,分别作出
,
的平分线
,
,然后提出问题:求
的度数.
![](https://img.xkw.com/dksih/QBM/2020/12/10/2618060314730496/2634277735186432/STEM/b10d6611-9bdd-4cbd-b802-03918821a5c1.png)
小明与同桌小丽讨论后,进行了如下解答:
特殊情况,探索思路
将三角板分别按图2,图3所示的方式摆放,
和
仍然是
和
的平分线,其中,按图2方式摆放时,可以看成是
,
,
在同一直线上.按图3方式摆放时,
和
相等.
(1)请你直接写出计算结果:图2中
的度数为______,图3中
的度数为______;
![](https://img.xkw.com/dksih/QBM/2020/12/10/2618060314730496/2634277735186432/STEM/6752f518-729d-47ea-becf-67bc94ac0ed4.png)
![](https://img.xkw.com/dksih/QBM/2020/12/10/2618060314730496/2634277735186432/STEM/91adf963-f261-4889-aca5-79317b733e44.png)
特例启发,解答题目
(2)请你完成李老师出示的题目的解答过程;
拓展结论,设计新题
(3)若将李老师出示的题目中条件“分别作出
,
的平分线
,
”改为“分别作出射线
,
,使
,
”,请你直接写出
的度数.
将一副三角板按如图1所示方式摆放,分别作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.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/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://img.xkw.com/dksih/QBM/2020/12/10/2618060314730496/2634277735186432/STEM/b10d6611-9bdd-4cbd-b802-03918821a5c1.png)
小明与同桌小丽讨论后,进行了如下解答:
特殊情况,探索思路
将三角板分别按图2,图3所示的方式摆放,
![](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/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
(1)请你直接写出计算结果:图2中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://img.xkw.com/dksih/QBM/2020/12/10/2618060314730496/2634277735186432/STEM/6752f518-729d-47ea-becf-67bc94ac0ed4.png)
![](https://img.xkw.com/dksih/QBM/2020/12/10/2618060314730496/2634277735186432/STEM/91adf963-f261-4889-aca5-79317b733e44.png)
特例启发,解答题目
(2)请你完成李老师出示的题目的解答过程;
拓展结论,设计新题
(3)若将李老师出示的题目中条件“分别作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.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/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4d8ec3aa1939513c0b04e2d8415bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d173d79d280a40a7dfefdc01abc011.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
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【推荐2】如图1,已知射线
在
的内部,若
,
和
三个角中有一个角的度数是另一个角度数的两倍,则称射线
是
的奇妙线.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/d6de33cb-1938-48b3-bdc7-50101e5e116b.png?resizew=210)
(1)一个角的平分线________这个角的奇妙线;(填“是”或“不是”)
(2)如图2,
.
①若射线
是
的奇妙线,则
的度数为________;
②若射线
从
位置开始,以每秒旋转
的速度绕点
按逆时针方向旋转,当
首次等于
时停止旋转,设旋转的时间为
.当
为何值时,射线
是
的奇妙线?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/d6de33cb-1938-48b3-bdc7-50101e5e116b.png?resizew=210)
(1)一个角的平分线________这个角的奇妙线;(填“是”或“不是”)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add60595ecea5d00ff1fbb2a5409be73.png)
①若射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/958e7abd79a73e20a4629233d7b42e4a.png)
②若射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654c79a470d5af5e0a34fd9233da5118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c46e2aafc96cbd4616f9bf6499f80fd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ecd76012d1b9c5e9fec6221e6e489c2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c46e2aafc96cbd4616f9bf6499f80fd1.png)
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解答题-作图题
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【推荐1】补全证明过程,即在横线处填上遗漏的结论或理由.
![](https://img.xkw.com/dksih/QBM/2018/4/4/1916922704019456/1920941225672704/STEM/e74607146b144a01b0426b8d15611d4a.png?resizew=152)
已知:如图,
.
求证:
.
证明:
已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
又
(对顶角相等)
______
等量代换![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
______
______
已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
______
______
内错角相等,两直线平行![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
______
![](https://img.xkw.com/dksih/QBM/2018/4/4/1916922704019456/1920941225672704/STEM/e74607146b144a01b0426b8d15611d4a.png?resizew=152)
已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55e854a1363390ba607649a208deacf.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e6f5241f614c7d310cbf3e25a6d615.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a7083310995c35f6e39f5a9759a868.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9a7744659ea3ea1a345e91c77059cdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/718d000f15c80ba635563a3b0146f51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6702925eb646ea6e5c8b72904b6a7761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0391a7eaff907d3701e07f80a588ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4a64ccd38a7a230fcc7b3a90faf7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0716532ec68cc402d60b74300aac3a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18964a6e3a954dc37fd5e259e3f941a8.png)
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名校
【推荐2】如图1,直线
分别交
于点
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
(1)求证:
;
(2)如图2所示,点
在
之间,且位于直线
异侧,连接
,若
,则
与
有何种数量关系?请说明理由;
(3)如图3所示,点
在线段
上,点
在直线
的下方,点
是直线
上一点(点
在点
的左侧),连接
,若
,
,请直接写出
与
之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b79c80cc81b5446dfac3ee97b03c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/2fba9e44-011b-4cc1-bd50-32945cbafbb9.png?resizew=476)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
(2)如图2所示,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f44755c5fee4b90266eac73ad47a128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b79c80cc81b5446dfac3ee97b03c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a80848a826267844f9d3e0717e430043.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b59874dae8b394a4e434aa3875708a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05cbf5c2be437d5794e83deca8a53e7a.png)
(3)如图3所示,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b2768587d7d0d507c22456c0280d78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79648df80a43f8afbc96c768487f3707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e58163e70c4cbfd04627ec824299b0f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d023a7602cc5cc4d77d176432ff78b75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86bfa0bbe05b01453e6ed15d74da2602.png)
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解答题-问答题
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【推荐1】如图1,
的角平分线
,
相交于点
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/d312e92e-3744-4b32-a098-a49bb45f1d98.png?resizew=175)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/48b7e40d-d432-4a32-b796-01083966a296.png?resizew=389)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/94e6c434-e297-4de7-9243-fee883a71f81.png?resizew=179)
(1)发现:
的度数为________;
(2)①猜想:
与
的数量关系为________;
②爱思考的小江对上述猜想进行了合理的推理,淘气的弟弟把他的稿纸撕了,仅剩如图2所示的部分过程,请把其余过程补充完整;
(3)拓展:如图3过点
作
的高
记为
,过点
作
的高
记为
;过点
作
的高
记为
,请写出
,
,
之间的数量关系并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/d312e92e-3744-4b32-a098-a49bb45f1d98.png?resizew=175)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/48b7e40d-d432-4a32-b796-01083966a296.png?resizew=389)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/94e6c434-e297-4de7-9243-fee883a71f81.png?resizew=179)
(1)发现:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024015816ece1fd176186ed0f04db8f9.png)
(2)①猜想:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
②爱思考的小江对上述猜想进行了合理的推理,淘气的弟弟把他的稿纸撕了,仅剩如图2所示的部分过程,请把其余过程补充完整;
(3)拓展:如图3过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac472bf62e40fec9c42ce7c141b22259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b53eab97158937f92039c1e133b0f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf0129d86a64b4509cea80c24ae65b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f285174fbf90a9742de57c1e53224cff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee515ef2232f214753420b1e6295fd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8e8854159e7443b5fe53436bf9e367f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b53eab97158937f92039c1e133b0f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f285174fbf90a9742de57c1e53224cff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8e8854159e7443b5fe53436bf9e367f.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,点
是
内一点,点
,
分别是边
,
上的两点,连接
,
,且
,点
为
延长线上一点,连接
,且
,
.
(1)求证:
;
(2)已知
,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b30155e0e3cf7c5146d3311e5b8da93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d1125b47dec1c5e93143ee59ad862a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddd756431b4d15841be4eed1eecb5a78.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/2fb66001-03ce-4e40-9cd6-f7c5e69ee710.png?resizew=159)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c58ae99e2136547839e7855475e868d.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82d4ccd59cd66a910335a5a2e6ad4f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d67caa956042197d36d651c4ec1a75b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐1】如图,已知正方形
,点
是边
上的一个动点(不与点
、
重合),点
在
上,满足
,延长
交
于点
.
;
(2)连接
.
①当
时,求
的值;
②如果
是以
为腰的等腰三角形,直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cda8b13c15d7426da8c717c9d1f3f2a4.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b670ec1599330f6af99c600404afcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/399e302b4df500446567f2b7f6d5d8d7.png)
②如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73e99c17d72c203b50802f19d4731545.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图①,在△ABC中,∠ABC和∠ACB的平分线交于点O,∠A=α.
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901403776499712/2901424985899008/STEM/ee92f5ba-28a3-4bec-9649-2e568e54fc2e.png?resizew=583)
(1)如图①,若∠A=50°,求∠BOC的度数.
(2)如图②,连接OA,求证:OA平分∠BAC.
(3)如图③,若射线BO与∠ACB的外角平分线交于点P,求证OC⊥PC.
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901403776499712/2901424985899008/STEM/ee92f5ba-28a3-4bec-9649-2e568e54fc2e.png?resizew=583)
(1)如图①,若∠A=50°,求∠BOC的度数.
(2)如图②,连接OA,求证:OA平分∠BAC.
(3)如图③,若射线BO与∠ACB的外角平分线交于点P,求证OC⊥PC.
您最近一年使用:0次