已知
内角A,B,C的对边分别为a,b,c,点G是
的重心,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/b7ddd3c2-ff5f-47bf-b4eb-e5bb70bcb0b4.png?resizew=126)
(1)若
,①直接写出
______;②设
,求
的值
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9dda408d508f71aa2a839a70a10b8ad.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/b7ddd3c2-ff5f-47bf-b4eb-e5bb70bcb0b4.png?resizew=126)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c39374cfdb9a366e8aad5b7130f31423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325140ec50c30f2104bfb8502c0a72b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4edacde88658c2758979c43e5b0204d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92daabae2aada36f619b9ae78aefe3e6.png)
更新时间:2023-11-10 18:57:58
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相似题推荐
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【推荐1】已知函数
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f6805134db62b2f2e51b8e794a50b21.png)
(1)求f(x)的最小正周期及单调减区间;
(2)若α∈(0,π),且
=
,求tan
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5ccf25df1dcb9d23aa1a3e81b18895f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f6805134db62b2f2e51b8e794a50b21.png)
(1)求f(x)的最小正周期及单调减区间;
(2)若α∈(0,π),且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce756187c2cc23ebadd5c5e48cf96fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6617cab665e2c120c99b705f244c7d66.png)
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解题方法
【推荐2】如图,一幅壁画的最高点
处离地面
米,最低点
处离地面
米.正对壁画的是一条坡度为
的甬道(坡度指斜坡与水平面所成角
的正切值),若从离斜坡地面
米的
处观赏它.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/a44a52cc-b862-43d6-8f00-5f206dc853f0.png?resizew=215)
(1)若
对墙的投影(即过
作
的垂线垂足为投影)恰在线段
(包括端点)上,求点
离墙的水平距离的范围;
(2)在(1)的条件下,当点
离墙的水平距离为多少时,视角
(
)最大?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8f58755aee89fb2cf72ba518dcee2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/a44a52cc-b862-43d6-8f00-5f206dc853f0.png?resizew=215)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)在(1)的条件下,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
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【推荐1】已知向量
,
,且
.
(1)求
的值;
(2)若
且
,点
为坐标原点,求
在
方向上的投影数量.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a41012b8346a091e0a510b60879db8f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01135c9bfdd25e91bc3086d1aac05a21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b19e9066e6ebe86de2108970c51a8b88.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e29be63ef7f305bb3a96cc0f7a9ee543.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a17491898e262bf44270327387e38ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f8783429be686df75afcd56e847dfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed492f7b29166ba5c1f0023b05a439c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3143307ad0ba4a631eac04e814993655.png)
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解题方法
【推荐2】已知函数
.
(1)求函数
在区间
上的值域;
(2)求函数
的单调递增区间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b4bb4fd567ec3d22da8a3395b19a143.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d51992c05a557cf6058664f1f8961e.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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解答题-证明题
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【推荐1】已知
的角
、
、
所对的边分别是
、
、
,设向量
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05347344ee62d3bbe61700641e0ed629.png)
,
.
(1)若
,求证:
为等腰三角形;
(2)若
,边长
,角
,求
的面积.
![](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/79528529454f9e2eca96f02736ac5c24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05347344ee62d3bbe61700641e0ed629.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54248677b61a929d2a215afeceab2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a70692cdbfe2262c5aa52d402fb5b4fe.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/126631748d85c93f65a147735e93eb54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1f72a9c6a2d0ac1050b68be34e5994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1d395e6c48c0676a1488a299479d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0334bc85843337c4dfcfdc5c638f9f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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【推荐2】如图所示,点
是边长为4的正方形
的中心,点
分别是
的中点,沿对角线
把正方形
折成直二面角
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/1fb390c5-dea9-43ec-bece-b90b69c5b893.png?resizew=356)
(1)求
的大小.
(2)求二面角
的平面角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d93949d8a15aca4e79cedb978590571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f0ac3005d5ecd6d4cea0ce99a47ef3c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/1fb390c5-dea9-43ec-bece-b90b69c5b893.png?resizew=356)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e6fd3e0bcc523ec7a8a6fcd2e4b239.png)
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【推荐3】在
中,a,b,c分别为内角A,B,C所对的边长,且满足
,记此三角形的面积为S.
(1)若
,求S的值;
(2)若
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f2b7d207f798df744a871fcd0f5b47.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3711c8ba16405959bcb0b70385da1d89.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86c1ecdd2d3f9fece66db3e5af7bb6ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7121dc5db5fae9c6564d6985660a7a9.png)
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解题方法
【推荐1】已知向量
,且
与
的夹角为
.
(1)求
及
;
(2)若
与
所成的角是锐角,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c17e99a205e376590debf77e92c021af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6849424bb49758b9c55fec214eef565.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afae9db82464afb37d387f6cbedc8139.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83c5803cc8c05849028a57c4bd4ee72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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【推荐2】已知:向量
.
(1)求
;
(2)求
夹角的余弦值;
(3)若
,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef8e420725b4ee2fb9db0cab07d4ec6.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a8d6f122739bfe3e5182375b585870a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb87bef0e638511ec0f86a176baea7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐3】已知向量
在正方形网格中的位置如图所示,若网格中每个小正方形边长为1,
.
;
(2)若
,求m值;
(3)若
与
的夹角为钝角,求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52cc33f2d63b6e908f515ad3a523d51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c452001ea4f4218ecddf540878b42ac3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e524977388a267d54a51cd2cb133cf.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
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