已知,点D在
的边
上,连接
.
(1)如图1,若
.求证:
;
(2)如图2,若
,
,
,
.求线段
的长;
(3)如图3,M、N分别是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
上的两点,连接
交
于点P,当
,
时,若
,直接写出
的值______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/2/a24984a5-8341-4d45-8206-bf9f9b0e43e6.jpg?resizew=364)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb576337b81841d9f1924c8b45c23aba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2674162368fd49dc195ba7d3e07bee5.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432cce1481829c4dfe2bd557f6e9aa4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194a2857b5c2b423f77a06512d2ed83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)如图3,M、N分别是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49eefd4471713ab7de8a59ec283d49e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92a7049a6e7d051c2522712926399261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3c5f14eaf95c878836c4f6c9440a52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ace55afd9133f5fe7577a785402d8ea.png)
更新时间:2023-10-30 10:41:35
|
相似题推荐
解答题-问答题
|
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名校
【推荐1】如图,在四边形ABCD中,AD//BC,AE平分
,BE平分
.
(1)AE
BE.
(2)若AE=4,BE=6,求四边形ABCD的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321ab6f85a747ff35416199319bfeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a51d88260736585f443d26ff33625a.png)
(1)AE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
(2)若AE=4,BE=6,求四边形ABCD的面积.
![](https://img.xkw.com/dksih/QBM/2020/11/6/2587020743450624/2592992633389056/STEM/488b71d22ab04986b3316badcd9b8e69.png?resizew=99)
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【推荐2】【问题】:如图1,等腰直角三角形
中,
,
,
是
的角平分线,点E为
上一点,
交
延长线于点F,连接
,探究
,
,
之间的数量关系.
【分析】:小明在思考这道题时,先通过测量猜想出
,然后他想到了老师讲过的“手拉手”模型,便尝试着过点E作
的垂线与
相交于点G(如图2),通过证明
,最终探究出
,
,
之间的数量关系.
(1)请根据小明的思路,补全
的证明过程;
(2)请直接写出
,
,
之间的数量关系;
【应用】(3)当
时,请直接写出
的长为 ;
【拓展】(4)若
的中点为点M,当B,E,M三点共线时,请直接写出
的长为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a566b100fb2ebe3d208f9b6527934218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40fe2cc764de5fa58e9d90d750c5c528.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
【分析】:小明在思考这道题时,先通过测量猜想出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac679f877d3e3b3acef1f1f8e3654b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b0acaf9fe8a68fdad616f599299e0e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(1)请根据小明的思路,补全
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b0acaf9fe8a68fdad616f599299e0e8.png)
(2)请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
【应用】(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc39144b305c67d44410d41053a1d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
【拓展】(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/5c10eae0-d959-4caf-beb3-f91a8680fc7e.png?resizew=349)
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【推荐1】在平面直角坐标系xOy中,已知点P(4,3),⊙O经过点P,过点P作x轴的平行线交⊙O于点E.
![](https://img.xkw.com/dksih/QBM/2022/5/8/2974830149918720/2975156918378496/STEM/577f351f-d704-4ae2-9b81-5508a81177f8.png?resizew=602)
(1)如图1,求线段OP的长;
(2)点A为y轴正半轴上的一动点,点B和点A关于直线PE对称,连接PA,PB.直线PA,PB分别交⊙O于点C,D.直线CD交x轴于点F,交直线PE于点G.
①点A运动到如图2位置,连接CE,DE.求证:∠DGP=
ECP.
②在点A运动过程中,当DF=OP时,求点D的坐标.
![](https://img.xkw.com/dksih/QBM/2022/5/8/2974830149918720/2975156918378496/STEM/577f351f-d704-4ae2-9b81-5508a81177f8.png?resizew=602)
(1)如图1,求线段OP的长;
(2)点A为y轴正半轴上的一动点,点B和点A关于直线PE对称,连接PA,PB.直线PA,PB分别交⊙O于点C,D.直线CD交x轴于点F,交直线PE于点G.
①点A运动到如图2位置,连接CE,DE.求证:∠DGP=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
②在点A运动过程中,当DF=OP时,求点D的坐标.
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【推荐2】(1)如图1,在
中,
,
,
平分
,
,
,求
的长;
(2)如图2,在
中,
,
,
平分
,
,
,求
的长;
(3)如图3,在
中,
,
,
,则
的长为__________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deece9a4d9301fb6028aa1f81a11c23b.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/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae8221601c7bd5c51fd520615581fa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e56feb858a38f68412d4d7691fcf86.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/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0af94eb81e5178f6b79cae9192c03fe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解答题-证明题
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【推荐1】如图1,抛物线
与
轴相交于点
,直线
与
轴相交于点
,与抛物线有公共点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/f852adc9-8556-4a2e-9762-b34ee5ad2f32.png?resizew=281)
(1)求证:直线
与抛物线只有唯一的公共点;
(2)过点
作
轴于点
,连接
,证明:
;
(3)如图2,直线
交新抛物线
于
两点,连接
交
轴于
点. 若
,说明直线
必过定点,并求此定点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3136beb16dc466c9a2d8e9f61422f63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21412b31a9411df5e2a3c709a4f31027.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/f852adc9-8556-4a2e-9762-b34ee5ad2f32.png?resizew=281)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323232ab36943d1d5d2831d70ffcff87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43443f8760832748fceef78f08a6dca9.png)
(3)如图2,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bb0a8e7d37aaf63a7547881e1e5ce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b73ec2e51e8bf082ec95b5ce8348de68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de9f075d2558b7dce0eb91148de84fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b89e104e2d1d957fb383baeb70756b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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【推荐2】如图,抛物线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df04abfcf792463c45866b9f32472c10.png)
与
轴相交于点
和点
,与
轴相交于点
,作直线
.
(2)在直线
上方的抛物线上存在点
,使
,求点
的坐标;
(3)在(2)的条件下,点
的坐标为
,点
在抛物线上,点
在直线
上.当以
,
,
,
为顶点的四边形是平行四边形时,请直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df04abfcf792463c45866b9f32472c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5bb89c3ad435f1ef59307b174105ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c052d7af2f98d95bac8725b608fba0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d01d844dfa7a0aeb99b7af13eb32efd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c050e4c6cbc6dae67623cd778728e2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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真题
解题方法
【推荐1】如 图1 ,直线
与
轴交于点
,与
轴交于点
,抛物线
经过点
和点
从点,开始沿射线
方向以每秒
个单位长度的速度平移,平移后的三角形记为
(点
的对应点分别为点
),平移时间为
秒,射线
交
轴于点
,交抛物线于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2020/8/7/2522794546782208/2522825229115392/STEM/cbc995052ba4446a88d3c5d1a2c51921.png?resizew=451)
(1)求抛物线的解析式;
(2)当
时,请直接写出
的值;
(3)如图2,点
在抛物线上,点
的横坐标是点
的横坐标的
,连接
与
相交于点
,当
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c966320d637cab491c67425ef1338966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7742e5211b1e4fdfb5162cc6398841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef644115c956ed62c3da8310c6f67ecd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927456b0989846a2f1573844bbaa2105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ec6ac1b6f96098c7bb421712cda7f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://img.xkw.com/dksih/QBM/2020/8/7/2522794546782208/2522825229115392/STEM/cbc995052ba4446a88d3c5d1a2c51921.png?resizew=451)
(1)求抛物线的解析式;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea117669b60b4308dcacf0443f6fc95e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/081ebba4c2c9f9077bda166a00da5855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360496a4f5cc8a5faca5e089ae4f9531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e89c3f6d1728bb668098674b051f03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
解答题-问答题
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较难
(0.4)
【推荐2】如图,线段EF与MN表示某一段河的两岸,EF平行MN.综合实践课上,同学们需要在河岸MN上测量这段河的宽度(EF与MN之间的距离),已知河对岸EF上有建筑物C、D,且CD=30米,同学们首先在河岸MN上选取点A处,用测角仪测得C建筑物位于A北偏东45°方向,再沿河岸走10米到达B处,测得D建筑物位于B北偏东55°方向,请你根据所测数据求出该段河的宽度,(用非特殊角的三角函数或根式表示即可)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/39ba0d09-9b41-4a2e-957c-f7ed101c06b6.png?resizew=184)
您最近一年使用:0次