上午8时,一艘船从港口A出发,以15海里
时的速度向正北方向航行,10时到达海岛
处,从
两处望灯塔
,分别测得
,若该船从海岛
继续向正北航行,求船与灯塔
的最短距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4333bb203d02814c146ed587b69ea69d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e80220af5e4d73d1acab4813a31ebb90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
更新时间:2024-05-11 08:58:18
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在
中,直径
与弦
相交于点P,
,
.
![](https://img.xkw.com/dksih/QBM/2022/12/6/3125127092101120/3127837527130112/STEM/237ca914e5744a3ebba945e48b19aa44.png?resizew=136)
(1)求
的度数;
(2)若
,求直径
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c49b0ba9d16d37be55fdafec031ae13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d40168826365374fe165678c104384.png)
![](https://img.xkw.com/dksih/QBM/2022/12/6/3125127092101120/3127837527130112/STEM/237ca914e5744a3ebba945e48b19aa44.png?resizew=136)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在
中,点E在
边上,
,将线段
绕A点旋转到
的位置,使得
,连接
,
与
交于点G.
;
(2)若
,求
的度数.
![](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/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c2b3d993a79210952ef190542700111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da8fe8f5f8a3f17561d70652ad1172a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e0e6403059d0a1bc74e66aa463c44f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec88884321733714de9db5466629ccf2.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,菱形
的边长为6,
,点
,
分别在边
,
上,
.
(1)求证:
是等边三角形.
(2)求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/25/dfea4ae8-f19d-4e40-994c-c5c5059c7661.png?resizew=206)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
名校
【推荐2】如图,在
中,
,
,D为
上一点,且
.动点P以每秒2个单位长度的速度从点A出发,沿着
匀速运动到点C时停止运动,设点P运动的时间为x秒,
的面积为y.
(2)请在直角坐标系中画出y的函数图象,并写出该函数的一条性质;
(3)若
与y的图象有且只有一个交点,请直接写出t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce548b0ffa7a575f5b945d7dd35ae18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfd66776565f049eb453c14fcaf79234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96645a3530e72d5d733d2c72147d340.png)
(2)请在直角坐标系中画出y的函数图象,并写出该函数的一条性质;
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a894bdb28f69df4e927de9c34b1f613.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】将矩形纸片
折叠,使点C刚好落在线段
上,且折痕分别与边
相交,设折叠后点C、D的对应点分别为点G、H,折痕分别与边
相交于点E、F,
(1)如图①,判断四边形
的形状;
(2)如图②,当点G与A重合时,若
,求线段
的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2c6c3cc1875ad112d8c4eac793337c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c8b21a087818284c9cd909cc56c814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c8b21a087818284c9cd909cc56c814.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/21/1a2d9ef2-a1c3-4bb8-b4cd-2194d479403f.png?resizew=420)
(1)如图①,判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ae90193d50ae60beafae6f2b4ebcd.png)
(2)如图②,当点G与A重合时,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e840c455b83632d9fd4e55da64b27e3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.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,AD,BC相交于点O,AC=BD,∠C=∠D=90°.
(1)求证:OA=OB;
(2)若∠ABC=30°,OC=4,求BC的长.
(1)求证:OA=OB;
(2)若∠ABC=30°,OC=4,求BC的长.
![](https://img.xkw.com/dksih/QBM/2022/1/2/2885574915358720/2886346878033920/STEM/3766b425-1bca-4bb2-b8c6-1d9cf8080b2f.png?resizew=176)
您最近一年使用:0次