如图,已知
,点
为
上一点,
、
分别平分
、
,
交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/6bc1890e-15dc-4ac8-9533-22ea293785df.png?resizew=151)
(1)求证
是等腰三角形;
(2)探索
、
、
之间的等量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53df2a88f461611f7159d0f2f8ef60e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d3f1c7f7ffdf572978468d5a3adde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/6bc1890e-15dc-4ac8-9533-22ea293785df.png?resizew=151)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
(2)探索
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
更新时间:2023-01-06 08:27:23
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,
,
绕顶点
按逆时针方向旋转
得到
,请说明
、
分别是哪个角的平分线?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://img.xkw.com/dksih/QBM/2019/12/10/2352139260379136/2352806297100288/STEM/e9adf08abdaf4acca61e7f76efe67bd2.png?resizew=347)
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【推荐2】如图,
中,CD是角平分线,
,交AC于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/25/4b0e4155-4a55-45f0-8abe-572135d85152.png?resizew=141)
(1)求证:
;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/25/4b0e4155-4a55-45f0-8abe-572135d85152.png?resizew=141)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0487ebca22d4aa1233073f81fd70a424.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31826fa6e138fe63f0edc47aceacf798.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3702b5620dbee356a8e560c78d223ad.png)
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解题方法
【推荐1】已知,如图1:
中,
、
的平分线相交于点
,过点
作
交
、
于
、![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)直接写出图1中所有的等腰三角形.指出
与
、
间有怎样的数量关系?
(2)在(1)的条件下,若
,
,求
的周长;
(3)如图2,若
中,
的平分线与三角形外角
的平分线
交于点
,过
点作
交
于
,交
于
,请问(1)中
与
、
间的关系还是否存在,若存在,说明理由:若不存在,写出三者新的数量关系,并说明理由;
(4)如图3,
、
的外角平分线的延长线相交于点
,请直接写出
,
、
,
之间的数量关系.不需证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13bd9e8b54864ca44115d24a5aeeb83c.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)直接写出图1中所有的等腰三角形.指出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67055d81409d2dc3260d1e261fb87723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d2c879bc50be4cc2a0c82042cf7b632.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d890499dca9a8ef30addafe41d6e771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ae24183e3ad652d9a7f3c2b277e7c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(4)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/2020/3/11/2417241915072512/2417403408596992/STEM/4e1b4ea617e242d48f28791577127f72.png?resizew=449)
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【推荐2】如图,在矩形ABCD中,AB=25,AD=12,P是BC边上一点,把△ABP沿AP折叠到△AEP,AE与CD交于点F,BF与AP交于G,恰有BF⊥AE.
![](https://img.xkw.com/dksih/QBM/2019/5/15/2204034361384960/2206996579827712/STEM/5ff630db9fdc429580759e72881c91bd.png?resizew=166)
(1)求证:BP=BG.(2)求DF和FG的长.
![](https://img.xkw.com/dksih/QBM/2019/5/15/2204034361384960/2206996579827712/STEM/5ff630db9fdc429580759e72881c91bd.png?resizew=166)
(1)求证:BP=BG.(2)求DF和FG的长.
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐1】如图,在
中,
,
,在
边上有一点E,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/cc53d51b-ad0e-4d23-804f-c8e9e9f7d63e.png?resizew=146)
(1)作
角平分线
,交
于点D(要求:尺规作图,保留作图痕迹,不必写作法和证明);
(2)在(1)的条件下连接
,若
,求
的度数.
注:本题第(2)小题在下面的解答过程的空格内填写理由或数学式.
解(2)∵
平分
,∴______①______,
在
和
中,
,∴____________
,
∴____________,
,
∵
,∴
,∴____________,
∵
,∴
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb980da8e86b4cfd322616dc84fc6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e702e136211878dce558e0457f15df63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f166307ca3b86dbd71aed464c497c4a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/cc53d51b-ad0e-4d23-804f-c8e9e9f7d63e.png?resizew=146)
(1)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)在(1)的条件下连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62dcef170114cd71b99f6646d364ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
注:本题第(2)小题在下面的解答过程的空格内填写理由或数学式.
解(2)∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b265d121f9ebc13671a5719604476a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c5a99245fab139bea5837f522346658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05f2681d3fd89e8039aa015a15c9f22c.png)
∴____________,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/579a613fddff909b37e56bc1ce857bee.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62dcef170114cd71b99f6646d364ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba11242dcc61d3c7c3555b598b5fdc89.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff6b73c365d32c15e5aeae05e568ce1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0419def8708b2ed6fdc078dad9ba7669.png)
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【推荐2】如图一,在
中,
,
,
是
边上的一点,连接
,将
沿
翻折,点
恰好落在
边上的点
处.
(1)求
的度数.
(2)如图二,将
绕点
顺时针旋转,使点
落在
的延长线上点
处,点
落在
的延长线上点
处.连接
.
①求
的度数.
②点
在
上且点
、
关于
对称,点
是
边上的动点,当
的值最小时,请直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc688c55cf2d34194d90355a1e9ac48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/8/af273272-c81b-414a-ad26-ad3815a5682c.png?resizew=328)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
(2)如图二,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14612abbcce72d9f7c15f01f35100152.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.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/c907c24f2914aa0c5a5ddcc525d04aa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f0fa9afed2fed16d8edf6e8db95c3ca.png)
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名校
【推荐1】已知:如图,点D为BC的中点,
,求证:
是等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ba77f66ecad8eb4a7a63f169f28a3b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/66049119-4519-4406-a35f-d631eca6e6b9.png?resizew=131)
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【推荐2】如图1,抛物线y=
x2+mx+4m与x轴交于点A(x1,0)和点B(x2,0),与y轴交于点C,且x1,x2满足x12+x22=20,若对称轴在y轴的右侧.
![](https://img.xkw.com/dksih/QBM/2022/1/16/2895513752723456/2951527378280448/STEM/267bdd2211724f8285d6937229ff422d.png?resizew=429)
(1)求抛物线的解析式.
(2)如图2,若点P为线段AB上的一动点(不与A、B重合),分别以AP、BP为斜边,在直线AB的同侧作等腰直角三角形△APM和△BPN,试确定△MPN面积最大时P点的坐标.
(3)若P(x1,y1),Q(x2,y2)是抛物线上的两点,当a≤x1≤a+2,x2≥
时,均有y1≤y2,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2022/1/16/2895513752723456/2951527378280448/STEM/267bdd2211724f8285d6937229ff422d.png?resizew=429)
(1)求抛物线的解析式.
(2)如图2,若点P为线段AB上的一动点(不与A、B重合),分别以AP、BP为斜边,在直线AB的同侧作等腰直角三角形△APM和△BPN,试确定△MPN面积最大时P点的坐标.
(3)若P(x1,y1),Q(x2,y2)是抛物线上的两点,当a≤x1≤a+2,x2≥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0874f019492261eb175bdcc08c189d.png)
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