在
中,
.
(1)证明:
为
的重心.
(2)若
,求
的最大值,并求此时
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17bd00f21e9ace05db352d22af5013c6.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc7064d10d2f23ab4066b87e2f0e9171.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e00dca7e69aecb730b9f2ba0774a053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
更新时间:2024-06-14 21:03:12
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相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】已知函数
的图像的一部分如图所示.
![](https://img.xkw.com/dksih/QBM/2012/3/14/1570802494373888/1570802499936256/STEM/1d70da66af4347429b301c44cce198cb.png?resizew=390)
(I)求函数
的解析式;
(II)求函数
的最大值与最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb7ee71e5a4d7c4882560bd178992a5.png)
![](https://img.xkw.com/dksih/QBM/2012/3/14/1570802494373888/1570802499936256/STEM/1d70da66af4347429b301c44cce198cb.png?resizew=390)
(I)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(II)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69fad705452adf5062a9bf6a29c87128.png)
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解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐2】已知函数
,且函数
.
(1)求函数
的解析式;
(2)若存在
,使等式
成立,求实数
的取值范围;
(3)若当
时,不等式
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2944a3b3241a68ec7d2b7b118dc0192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa1e39edae569f7aeb42f136eeb7a49.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
(2)若存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b5791e3050af8940d9376dcef24fbcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9101b9a706c3ec820bef4f5c6d26512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)若当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e5175ebfaeb602ade4725ac356b9828.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd5e26f7386aa1607116062d2dd5bf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐1】请从①
;②
;③
这三个条件中任选一个,补充在下面问题中,并加以解答(如未作出选择,则按照选择①评分.选择的编号请填写到答题卡对应位置上)
在
中,
,
,
分别是角
,
,
的对边,若______,
(1)求角
的大小;
(2)若
,
为
边上一点,
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2135d486dc571953e077f23e931e919f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a23f98e1b7271001fab336e180fa41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d323eb7501a1c08efd42ea72e45717.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d1f28ad9c485e0d6d7badc826430e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】在
中,内角
,
,
所对的边分别为
,
,
,满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c7a722d6bc7ca3f4fe38e0f3b0d1c7a.png)
(1)求角
的大小;
(2)若
,
边上的中线
的长为
,求
的面积.
![](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/5c7a722d6bc7ca3f4fe38e0f3b0d1c7a.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21143d45f8a1eec5a18f3b82c78ac217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de31a7b108b0fdc888133f701e7c79b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐1】一艘船以
的速度向垂直于对岸方向行驶,船实际航行方向与水流方向成
角,求水流速度和船实际速度.
![](https://img.xkw.com/dksih/QBM/2016/11/1/1826272361955328/1826272362143744/STEM/1343ac5cfb5948cb900479ac8b145605.png)
![](https://img.xkw.com/dksih/QBM/2016/11/1/1826272361955328/1826272362143744/STEM/0e74497306294ce98da32dffa10f6ef6.png)
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解答题-问答题
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适中
(0.65)
名校
【推荐2】已知
分别是与x轴,y轴正方向相同的单位向量,
,对任意正整数n,
.
(1)若
,求a的值;
(2)求向量
;
(3)记
,若不等式
恒成立,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d0f5edd2ad69fa56e7782b85bba717.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0fd4ce43685ca97ee2816f6312a5232.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd2808f6a2f014dcc6833a6f23f704f3.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef973011d4954d469d4fb1b006feb2e1.png)
(2)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cae8824ce99db6c44633cc81b2c4257d.png)
(3)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2938bdc6bcb2e3cd8d6510263d8dda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79672ffe0b0627b99daa3d4f5984d4b.png)
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解答题-证明题
|
适中
(0.65)
名校
【推荐1】(1)已知点
,求证:
;
(2)已知向量
不共线,且
,求证:
三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff2e8f9baf9d42187894cc588383ebc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
(2)已知向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10814bc3db929e79874befe96cf4e3d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66168b44efda1a9e56be3847d2bc8cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eacedc00563807ce87bb481fdef8cbd.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐2】如图,在
中,
是
的中点,D是线段
上靠近点
的四等分点,设
,
.
长为2,
长为8,
,求
的长;
(2)若
是
上一点,且
,试判断
三点是否共线?并说明你的理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.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/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14390e9b6b44472bdc7a131133ab39b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cd14dfc0024459f9d8e594c95c5106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc790cfaa59a808c25a7edb95dc29fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1ee1ea509875a6ce53b37e5e25d0ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb4817f6d025306bfcba653b4e8d4dc6.png)
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