在直角坐标平面
上的一列点
简记为
若由
构成的数列
满足
其中
为方向与
轴正方向相同的单位向量,则称
为
点列.有下列说法
①
为
点列;
②若
为
点列,且点
在点
的右上方.任取其中连续三点
则
可以为锐角三角形;
③若
为
点列,正整数若
,满足
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa8c70ae987108297f3db5928a2e26d.png)
④若
为
点列,正整数若
,满足
则
.
其中,正确说法的个数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c730f8788ed12d109a19f1b30fb28d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23862d3f6fe4e871cc3e4cd1836213a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e64e2b95d4c62288288965cf4db053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039271f3111b0e21bc1282fcc22cf016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d98e297d9913e4cf3f02e9784a88a3fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89cdb00326a922074494892c166aeefe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23862d3f6fe4e871cc3e4cd1836213a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c8f1d479672c63860821c026c7ae47a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23862d3f6fe4e871cc3e4cd1836213a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d812c7378eb14cd328ca0feb6cfa8072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97750a40688f592447e36349df63e8d6.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23862d3f6fe4e871cc3e4cd1836213a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfc529610992db25f9e2c718eeeb14a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1576d1aa7d0455db3ec684ed1f37448c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa8c70ae987108297f3db5928a2e26d.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23862d3f6fe4e871cc3e4cd1836213a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfc529610992db25f9e2c718eeeb14a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1576d1aa7d0455db3ec684ed1f37448c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4006e8af4f30377d1621184d6f13abd7.png)
其中,正确说法的个数为
A.1 | B.2 | C.3 | D.4 |
更新时间:2017-12-15 09:43:03
|
相似题推荐
单选题
|
较难
(0.4)
名校
解题方法
【推荐1】如图,
中,
,
,
.在
所在的平面内,有一个边长为1的正方形
绕点
按逆时针方向旋转(不少于1周),则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/193f32945ff527d1db7616c4eaee8d4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45c9bd06eb25aeb447df0936950513de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e84651cfbf6a25234265baa7ef676ea.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
【推荐2】已知
是圆
上的动点,且
.
是圆
的动点,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bf7d969ee6f3131219a0ae5d40e971e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0ac718bef601f96e5c542506009daa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3236613835e42ebb143c1ff3a1c75e1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较难
(0.4)
名校
解题方法
【推荐1】如图,△
,△
是全等的等腰直角三角形,
为直角顶点,
三点共线.若点
分别是边
上的动点(不包含端点).记
,
,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/3118ca82-f48c-4321-b7e6-0a153756a889.png?resizew=226)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02c748db8341a9ae5969e0ab5f6ce901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89503a2ab9419c0da33ea94c321dd78f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04d468be20b4d43f5de75416de20e8ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c87cd5704b612b44ad048a43584344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5425108c557f0f21474c045334f97d9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8634da894ee2744a537654918c6da8b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da160ca8499d1242879f489643c9e09c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c4e516667a8cda17d953fe19085a961.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/3118ca82-f48c-4321-b7e6-0a153756a889.png?resizew=226)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较难
(0.4)
名校
【推荐2】已知椭圆
与圆
恰有两个公共点,若点
在
上,且位于第一或第四象限,点
为
的右焦点,则
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72b6ee2feb1ffc89233dac4e0da871f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc913bc204342a3c2e9d80d13078fb8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acf73c6f33ebc245731afe40171c6dcc.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较难
(0.4)
【推荐1】命题:在三角形中,顶点与对边中点连线所得三线段交于一点,且分线段长度比为
,类比可得在四面体中,顶点与所对面重心的连线所得四线段交于一点,且分线段比为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe103f073845122c66f22dcb14b711f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较难
(0.4)
【推荐2】下面各选项用类比推理,现给出了以下四个结论
①已知三条直线
、
、
,若
,
,则
.类推出:已知向量
、
、
,若
,
,则
.
②已知实数
、
,若方程
有实数根,则据判别式
,有
.类推出:已知复数
、
,若方程
有实数根,据判别式
,有
.
③以原点
为圆心,
为半径的圆方程
,类推出:以空间原点
为球心,以
为半径的球方程为
.
④若集合
,
,
,
,满足
,则称
,
,
,
为集合
的一种离散.即
时,有
种离散;
时,有
种离散;
时,有
种离散;
……,类推出:
时,必有
种离散.
则正确的结论编号为( )
①已知三条直线
![](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/7ff4e42856fa5f6a4e12993e53b065e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e7f48cb7e14361e0e7b20eae592cee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1dd133d58073910a0bf45dfaf970130.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/d366d8fbb7258ee051f49977441e14a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/076559f08d17fb25e82886e791719e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b23cc1e2140104001dd399ace17e9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01befa7f7561b4f33725fd714dbca42c.png)
②已知实数
![](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/1146110d4382c714c10de00dd1273b7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f90d5c270e921517a949db5cd70b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/957788c37ffa9ddfd51079d556f44c9c.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/1146110d4382c714c10de00dd1273b7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f90d5c270e921517a949db5cd70b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/957788c37ffa9ddfd51079d556f44c9c.png)
③以原点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bef49f4847f1c47ba40e100d62355c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3503d330608e7138d1b529aba4512fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bef49f4847f1c47ba40e100d62355c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa2c17a5f216d6529186457fca6dabd6.png)
④若集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ce52015325c0436574d875081f417d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/871e716ac2673f621095e27edae7506c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c09a0d924acb0b70f5b92b1ef2b6b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4e8a2c770e2b5be5e6d4591eda556f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a2ac0a62b045de3d60dba0a0a92287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866144f3109bdbe7e8358c063152d928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/911f3ab7bddce2449f92426a8839aa9e.png)
……,类推出:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff666b8fcf4bcee736543d1a3dfb3c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f483075e0778776b76d625159bdbbaf.png)
则正确的结论编号为( )
A.①③ | B.③④ | C.②③ | D.①② |
您最近一年使用:0次