在平面直角坐标系中,三角形△ABC为等腰直角三角形,AC=BC,BC交x轴于点D.
(1)若A(﹣8,0),C(0,6),直接写出点B的坐标 ;
(2)如图2,三角形△OAB与△ACD均为等腰直角三角形,连OD,求∠AOD的度数;
(3)如图3,若AD平分∠BAC,A(﹣8,0),D(m,0),B的纵坐标为n,求2n+m的值.
(1)若A(﹣8,0),C(0,6),直接写出点B的坐标 ;
(2)如图2,三角形△OAB与△ACD均为等腰直角三角形,连OD,求∠AOD的度数;
(3)如图3,若AD平分∠BAC,A(﹣8,0),D(m,0),B的纵坐标为n,求2n+m的值.
![](https://img.xkw.com/dksih/QBM/2021/12/17/2874369167458304/2876548092870656/STEM/d736cebe-3aa6-4a66-9ed1-d7ab58fca12c.png?resizew=533)
更新时间:2021-12-20 12:54:59
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解答题-问答题
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【推荐1】在如图所示的平面直角坐标系中,解答下列问题:
三点,分别在坐标系中找出它们,并连接得到三角形
;
(2)将三角形
向上平移4个单位,得到三角形
;
(3)求三角形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a62ca2d28e218c508ee25d77f7b59840.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)将三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
(3)求三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
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解答题-作图题
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【推荐2】正方形网格中,每个小正方形的边长均为1个单位长度,△ABC的三个顶点的位置如图所示,A(-2,3),B(-3,1),C(-1,2),现将△ABC平移先向右平移3个单位长度,再向下平移2单位长度.
(点
分别是B、C的对应点);
(2)写出点
三点的坐标;
(3)求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ee6e1d480ece7117e1f87ebf4bbeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d10c993e04bb5a0a69bff3a1a7d403.png)
(2)写出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b6386e1f590de54a691c86364d1eee8.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ee6e1d480ece7117e1f87ebf4bbeea.png)
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解答题-作图题
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【推荐1】线段
的端点
,
在
的正方形网格的格点上.只用无刻度的直尺在网格中画图(保留画图痕迹,每小题画出一个即可).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/670cad55-c2d7-43e6-8e79-bf0f7ccce411.png?resizew=352)
(1)在图1中找出格点
,使
:
(2)在图2中找出格点
,使
;
(3)在图3中画出非格点 的点
,使
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](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/abd4be97adde17423d59d86d18318c2c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/670cad55-c2d7-43e6-8e79-bf0f7ccce411.png?resizew=352)
(1)在图1中找出格点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
(2)在图2中找出格点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b03bf58cba56d1b98a8a457982870b4.png)
(3)在图3中画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1070d38d2fea1dc88c6eb31d320b763.png)
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解题方法
【推荐2】数学课上老师让同学利用三角形纸片进行操作活动,探究有关线段之间的关系
问题情境:
如图1,三角形纸片
中,
,将点
放在直线
上,点
位于直线
的同侧,过点
作
于点
.
初步探究
(1)在图1的直线
上取点
,使得
得到图2,猜想线段
与
的数量关系,并说明理由;
变式拓展:
(2)小颖又拿了一张三角形纸片
继续进行拼图操作,其中
,小颖在图1的基础上.将三角形纸片
的顶点
放在直线
上,点
与
重合,过点
作
于点
.
请从下面
两题中任选一题作答,我选择_________题
.如图3,当点
与点
在直线
的异侧时,探究此时线段
之间的数量关系,并说明理由.
.如图4,当点
与点
在直线
的同侧,且点
在线段
的中点时,探究此时线段
之间的数量关系,并说明理由.
问题情境:
如图1,三角形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bbd85114fc452f4b2469f755c1ad83e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13b505788d3d02bf232ac637fc3a8ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
初步探究
(1)在图1的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1ac3ab8d3ce5e61fd2f89761f80976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
变式拓展:
(2)小颖又拿了一张三角形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39bfd8e9f2f08a5807a23677988b240b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5071a1e80afd6968ca7f613917d92730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39bfd8e9f2f08a5807a23677988b240b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0881990aaabc3e4aeacbcb525bbfde8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
请从下面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0013d2724441028f77d43dc4276847ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9170078058098bd639577c685162d073.png)
![](https://img.xkw.com/dksih/QBM/2020/12/14/2614022703726592/2614896749125633/STEM/029022ff-d313-491c-ad61-e1f0149e4818.png?resizew=624)
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解答题-证明题
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【推荐1】如图,在平行四边形
中,E、F分别是
中点,连接
.
;
(2)若
,
,
,求平行四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcf86f7cf381c563ad80af86feeed83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/343f75e17b862051b15696334fec1eff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad93bdc4f5a8ac154d8084080ccf1d82.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135df28b0eaf638c6ebbdde3cfd164f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-问答题
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【推荐2】如图,在
中,
,
,点
、
、
分别在
、
、
边上,
沿直线
翻折后与
重合.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/7fac76c0-143d-4063-9f49-20e1476d5ce3.png?resizew=341)
(1)求
的面积;
(2)试问
是否有可能与
相似,如有可能,请求出
的长;如不可能,请说明理由;
(3)设
,
,求
与
的函数解析式,并写出函数的定义域.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e4f0c1c9cca0555906d8a53e1a6803d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/7fac76c0-143d-4063-9f49-20e1476d5ce3.png?resizew=341)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)试问
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a37ba261860ddad9d11b2e8348a8f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4a7d7c2253a1686c61f8b8f3f6c6a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10b9f48b80427d1ec649873cb6aac731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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解答题-证明题
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名校
【推荐1】如图,
中,
,垂足为D,点E、F、G分别是
中点,直线
交
点G.
是菱形;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5354b9a29505e53db1ae3c3263e04d7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbe05715b12f0a30e39277912b8d2b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a273f2a61c6d88dd1f3df3cce58d2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085cbdd37657b21dd1b686fc02d4f223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
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解答题-作图题
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名校
【推荐2】在学习实数时,我们知道了正方形对角线的长度是边长的
倍,所以等腰直角三角形的底边长是腰长的
倍.例如,图1中的四边形ABCD是正方形,
ABC是等腰直角三角形,则AC=
AB.
小玲遇到这样一个问题:如图2,在等腰三角形ABC中,AB=AC,∠BAC=45°,BC=2
,AD⊥BC于点D,求AD的长.
小玲发现:如图3,分别以AB,AC为对称轴,分别作出
ABD,
ACD的轴对称图形,点D的对称点分别为E,F,延长EB,FC交于点G,可以得到正方形AEGF,根据轴对称图形的性质和正方形四条边都相等就能求出AD的长,请直接写出:BD的长为 ,BG的长为 ,AD的长为 ;
参考小玲思考问题的方法,解决问题:
如图4,在平面直角坐标系xOy中,点A(3,0),B(0,4),AB=5,点P是
OAB外角的角平分线AP和BP的交点,直接写出点P的坐标为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
小玲遇到这样一个问题:如图2,在等腰三角形ABC中,AB=AC,∠BAC=45°,BC=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
小玲发现:如图3,分别以AB,AC为对称轴,分别作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
参考小玲思考问题的方法,解决问题:
如图4,在平面直角坐标系xOy中,点A(3,0),B(0,4),AB=5,点P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847369672392704/2847788620644352/STEM/9d0f5ac4-91b0-438c-ae58-135b9c39b69c.png?resizew=614)
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