已知
的内角
,
,
所对的边分别为
,
,
,向量
,
,
.
(1)若
,
,
为边
的中点,求中线
的长度;
(2)若
为边
上一点,且
,
,求
的最小值.
![](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/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/187536a989b48bf99257e815a70bfe36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ab8310eb6243b61af0fe89f7fa6ad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7cb5138a03b19266f82223899a614f7.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e15cbd7c42d7b15d7ba8d2b28ab8df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f449a1158da738d2c6a49ccfa90a4400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f70a5e0d17e1c0559b6e19059b173fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd2ed49b4be25eac88aa2af01aa84c15.png)
20-21高一下·福建福州·期中 查看更多[7]
福建省福州市八县(市、区)一中2020-2021学年高一下学期期中联考数学试题广东省广州市铁一中学等三校2022届高三三模联考数学试题辽宁省渤海大学附属高级中学2021-2022学年高一下学期第二次阶段性考试数学试题(已下线)专题13 平面向量(模拟练)-2江苏省盐城市响水县清源高级中学2022-2023学年高一下学期3月学情分析考试数学试题(已下线)11.1 余弦定理(分层练习)-2022-2023学年高一数学同步精品课堂(苏教版2019必修第二册)广东省惠州市第一中学2023-2024学年高一下学期第一次阶段考试数学试题
更新时间:2022-04-10 11:45:43
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解答题-问答题
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解题方法
【推荐1】费马点是在三角形中到三个顶点距离之和最小的点.具体位置取决于三角形的形状,如果三角形的三个内角均小于
,费马点是三角形内部对三边张角均为
的点;如果三角形有一个内角大于或等于
,费马点就是该内角所在的顶点.
已知△ABC中,角A,B,C所对的边分别为a,b,c,O为费马点.
(1)若
,
,
,求
的值;
(2)若
,
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
已知△ABC中,角A,B,C所对的边分别为a,b,c,O为费马点.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783d6adfa8fb1352679c5185258d842a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb5bac75f36bb1dc5c8190d4dbe681d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/569b5df7e2e4642091364efefe8dddf9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa1466856bf2570685d3629c1f813748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2bd0a04afc05de0f6a86ada42411f2.png)
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解题方法
【推荐2】如图,在平面四边形ABCD中,点B与点D分别在直线AC的两侧,
.
(1)已知
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ee81929c987732fcb379802eeef7a7.png)
(i)当
时,求
的面积;
(ii)若
,求
.
(2)已知
,且
,求AC的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ad8d16722f5b9e7fd2602f14d5ffbe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/80f92d69-59c4-4d03-91dd-20b5dd8d3452.png?resizew=155)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ee81929c987732fcb379802eeef7a7.png)
(i)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/153cca04b25317d1d4a38174801921e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(ii)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d48755570118fbbd419054840cfda45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1d36437d9e50f560536853ecd636d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce6b69806d0f60aa5ec964460abd7ccf.png)
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【推荐1】设两向量
,
满足
,
,
,
的夹角为
.若向量
与向量
的夹角为钝角,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8315ec34019d719771152be2252106e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf39ca3294f5520518dd4f1c0609876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3215aea1a7192a32ef5cd584720295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e670be07a738f6f148b0506bd131d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8315ec34019d719771152be2252106e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf39ca3294f5520518dd4f1c0609876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/449c5063948cea4fd61325e7d24f49b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bc88fd9769cede694f993e9c69df624.png)
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【推荐2】如图,在平面斜坐标系xOy中,与x轴同向的单位向量为
,与y轴同向的单位向量为
,
与
的夹角为
.定义:若
,则点P的斜坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/fc19d39b-1295-4cee-9aba-64ff3abe83ff.png?resizew=144)
(1)点P的斜坐标为
,求点P到原点O的距离;
(2)点P的斜坐标为
,若点P到原点O的距离等于1,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48bd8a052e56b53a66497b4b55a968a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc155e36276a2226c40a1f4ef7a0f41a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48bd8a052e56b53a66497b4b55a968a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc155e36276a2226c40a1f4ef7a0f41a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f575acbddfb3a48fb727402d59f6412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0203b006524305c3d8ee0b6c34cd872b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/fc19d39b-1295-4cee-9aba-64ff3abe83ff.png?resizew=144)
(1)点P的斜坐标为
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(2)点P的斜坐标为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29ebc856291255f2d4a6c20b982a2442.png)
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【推荐1】如图,在
中
,点
为
中点,点
为
的三等分点,且靠近点
,设
,
,
,
,且
,
与
交于点
.
![](https://img.xkw.com/dksih/QBM/2022/4/23/2964199331225600/2966953581207552/STEM/213a02f2-ad28-4ad7-8c88-adb406ae8628.png?resizew=180)
(1)求
;
(2)若点
为线段
上的任意一点,连接
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c149e355f8d55483ceeca43d6e2848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc2c62290eb2fb969f9dd68d3d99d82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325ba8093bd40f00a79e3c49010ea704.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/2022/4/23/2964199331225600/2966953581207552/STEM/213a02f2-ad28-4ad7-8c88-adb406ae8628.png?resizew=180)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b23168de61460a0bd15624fd5a634d8.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32524950cf6129b33a98fb8a7139582e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8eea53197ca199e6dcd243311753061.png)
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【推荐2】奔驰定理:已知
是
内的一点,
,
,
的面积分别为
,
,
,则
.“奔驰定理”是平面向量中一个非常优美的结论,因为这个定理对应的图形与“奔驰”轿车(Mercedes benz)的logo很相似,故形象地称其为“奔驰定理”若
是锐角
内的一点,
,
,
是
的三个内角,且点
满足
.
![](https://img.xkw.com/dksih/QBM/2021/11/18/2854152242618368/2861025062576128/STEM/f9d1f4a9-01a3-4476-a258-05d21013fd8f.png)
(1)证明:点
为
的垂心;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319b6a5373bc8eb13772b8e6d047779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea3c7cd2f23b4521e64a7e64844ec48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/089e8a7f6c535fc3cd270af428d55f65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9659621d48404d8e5479cbab9050e5a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec09a159d6760fca8ae5966bf97b4e49.png)
![](https://img.xkw.com/dksih/QBM/2021/11/18/2854152242618368/2861025062576128/STEM/f9d1f4a9-01a3-4476-a258-05d21013fd8f.png)
(1)证明:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548011a81b29fc3b51b7f2bea99126e7.png)
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【推荐1】已知函数
.
(1)当a=1时,求曲线
在x=2处的切线方程;
(2)当
时,曲线
上存在分别以
和
为切点的两条互相平行的切线,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f59560924a9637f966325e52e50ac549.png)
(1)当a=1时,求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a671406a5442a3088a4ee1d064114a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45dddee525114c09ee0d1205aed6e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3b54e0dcdc081d45fb3df933cddc29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450398974b1561ca801e102e16df6789.png)
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【推荐2】已知函数
.
(1)讨论
的单调性;
(2)若
有两个零点
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d228e13da16c68f15a7269a0b51a6a9a.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df3da00fe1feafb42d7e2254dd5f8589.png)
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【推荐3】已知函数
.
(1)若
,解不等式
;
(2)对任意满足
且
的实数
,若总存在实数
,使得
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67fc3a27a629c211bd93d9228f0f0ee7.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f61db73a5a9bce4ece8259a4c7d29376.png)
(2)对任意满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2fcc99ac0ea015119c6c9419c86adc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d18bf530a9821a3965cf19f1df966c30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd02ceddf9a8b83b0e41117569c9bb5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9d50199acd936974ccc305e88f3f6d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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