在
中,点
为
所在平面内一点.
(1)若点
在边BC上,且
,用
表示
;
(2)若点
满足
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddecea84834f1ad110b363776846c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/471bc8ce66c3e550baaf97be9d742e33.png)
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac077c25a98e791e4a81b1c48c09015d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0be656083580a03c6481fb75881b84f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7239b3f2d88c2e45e17e5de9ae1a332.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c27eda162792128da25f541303a3088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2688a00327f7f96de6a77ab9b1c9ae7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddecea84834f1ad110b363776846c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/471bc8ce66c3e550baaf97be9d742e33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef1a0c7211cb871554b9e2f17100d739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5cb63aeea0b37799404c8fec092b21d.png)
更新时间:2024-05-22 08:59:44
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相似题推荐
解答题-问答题
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【推荐1】在梯形ABCD中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/b108b056-78b3-411a-9e78-2f8b91e573ee.png?resizew=123)
(1)求AC的长;
(2)求梯形ABCD的高.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa7a4b948bf3616dde5d802cc375990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/309f4de20f8aef0725eea43a16b8f79a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/b108b056-78b3-411a-9e78-2f8b91e573ee.png?resizew=123)
(1)求AC的长;
(2)求梯形ABCD的高.
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【推荐2】
,
,
分别为
的内角
,
,
的对边.已知
.
(1)求
;
(2)若
,
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb51f22af8767d72f14ecd082681b9c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61e47bd6b5a9eb098028f7078ad74dde.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8af097c5944be429ff3fe40dfd112d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b4eb19600a5049cdc998dff85ce25d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】已知
分别为
内角
的对边,若
是锐角三角形,需要同时满足下列四个条件中的三个:
①
②
③
④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bb3aeb227e9a9d25bcb7f6d803d2d11.png)
(1)条件①④能否同时满足,请说明理由;
(2)以上四个条件,请在满足三角形有解的所有组合中任选一组,并求出对应的
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8c65bea2c80af038768b74250c694e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6f8e7cd55bfb0c577d1b12830bcb698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63957fe9482fe2fb7aa6a1cda2ac0c01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bb3aeb227e9a9d25bcb7f6d803d2d11.png)
(1)条件①④能否同时满足,请说明理由;
(2)以上四个条件,请在满足三角形有解的所有组合中任选一组,并求出对应的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
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【推荐2】在
中,角
,
,
的对边分别为
,
,
,且
.
(1)求角
;
(2)若
,且
的面积为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/155ecc4a22a0933429ed61e214a7aa27.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d3dcbb853e4b9fd1d011bd5f1948018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
【推荐2】如图所示,在平行四边形ABCD中,M,N分别为DC,BC的中点,已知
,
,试用
,
表示
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692be13a48cee7226f475c6a0bb94552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a32f6c4a670f770793461847edea4ee0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/337ab4dc61186ca58bb0605cb6d02df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd4b9ad667f6da79bc3a5737cbc1eee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/230d8f4e80dd0f2ae874043632acda0b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/0099de0f-95d6-4827-9463-aa1f816c90f9.png?resizew=152)
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【推荐3】在平行四边形
中,
,
为
中点.
(1)若
,且满足
,求
的长;
(2)若
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53d0eee2950252fe5340c9e4a2062676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aebababf43bd15d796e6071f2d01445.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d08f0ab6e573253450e03427e13db1.png)
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