1 . 在数列
中,若
(
,
,
为常数),则
称为“等方差数列”.下列对“等方差数列”的判断:
①若
是等方差数列,则
是等差数列;
②
是等方差数列;
③若
是等方差数列,则
(
,
为常数)也是等方差数列.其中正确命题序号为
__________ (写出所有正确命题的序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44818d415cf4e4af51151193e204bdd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/362832fa3d3c13c1eafd565349d66dce.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef891fc99921b6093392c1e3c5347d1.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a561552fc52b697f1a7f1c81c2f637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46b6d151d3f864bae873987f6db9327a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2018-05-02更新
|
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|
2卷引用:【全国市级联考】四川省南充市2018届高三第三次联合诊断考试数学文科试题
2 . “曼哈顿距离”是人脸识别中一种重要的测距方式.其定义如下:设,
是坐标平面内的两点,则A,B两点间的曼哈顿距离为
.在平面直角坐标系中
中,下列说法中正确说法的序号为
①若,
,则
;
②若O为坐标原点,且动点P满足:,则P的轨迹长度为4;
③设是坐标平面内的定点,动点N满足:
,则N的轨迹是以点
,
,
,
为顶点的正方形;
④设,
,
,则动点
构成的平面区域的面积为10.
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3 . 给出以下四个结论:
①平行于同一直线的两条直线互相平行;
②垂直于同一平面的两个平面互相平行;
③若
,
是两个平面;
,
是异面直线;且
,
,
,
,则
;
④若三棱锥
中,
,
,则点
在平面
内的射影是
的垂心;
其中错误结论的序号为__________ .(要求填上所有错误结论的序号)
①平行于同一直线的两条直线互相平行;
②垂直于同一平面的两个平面互相平行;
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/539a38ada26356d73024fb8533449c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209323a7a4d015f7e570ec578c1731f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/713288c700aee0f6f797e06760466185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73552465f894573a9147f9a81779b5be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de666db0febae223cc4d1dc189d71ca6.png)
④若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
其中错误结论的序号为
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4 . 声音是由物体振动产生的声波,其中包含着正弦函数,纯音的数学模型是函数
,我们听到的声音是由纯音合成的,称之为复合音,若一个复合音的数学模型是函数
,给出下列结论:
①
的图象关于直线
对称; ②
在
上是增函数;
③
的最大值为
; ④
的图象关于
对称
其中正确说法的序号为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e83347805bcbdf7f28616c4feeeebb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc97e5ada39650b93091d927be157b.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17c3319647314c3b6d82958a909acd2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ba7039324a6d810f4d5603d4edeb70e.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba8c5671c7a231e69641186f554755f0.png)
其中正确说法的序号为
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5 . 如图,矩形
中,
,
为边
的中点,将
沿直线
翻折至
的位置.若
为线段
的中点,在
翻折过程中(
平面
),给出以下结论:
①三棱锥
体积最大值为
;
②直线
平面
;
③直线
与
所成角为定值;
④存在
,使
.
则其中正确结论的序号为_________ .(填写所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f80f51c31583fea58fde645474d60b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa2a83fed9bf4cb09d84a980452e346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8588e18e27bfebf7c81c7e3c7efb1149.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
①三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb79f948d408ab4fb6708bde172c5e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11b9f96b8ecc3cb000bb2f030809f225.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c70966a318ef8ecf874257f5c5e5db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
③直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce1b066f8869d0ff4513f7a99745125.png)
④存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa2a83fed9bf4cb09d84a980452e346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2181c78134c310f746eab44b9124e63b.png)
则其中正确结论的序号为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/2/db8c3c80-3639-479e-8ae4-e7aeaef6394b.png?resizew=239)
您最近一年使用:0次
2022-07-01更新
|
1378次组卷
|
5卷引用:四川省遂宁中学校2022-2023学年高二上学期9月月考数学(理)试题
6 . “曼哈顿距离”是人脸识别中一种重要的测距方式.其定义如下:
设
是坐标平面内的两点,则A,B两点间的曼哈顿距离为
.
在平面直角坐标系中
中,下列说法中正确说法的序号为__________
①.若
,则
;
②.若O为坐标原点,且动点P满足:
,则P的轨迹长度为
;
③.设
是坐标平面内的定点,动点N满足:
,则N的轨迹是以点
为顶点的正方形;
④.设
,则动点
构成的平面区域的面积为10.
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a1467ecf286e3cadaf5aa006606f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/093c6d5bcaa69cea79b24688f5d1bd97.png)
在平面直角坐标系中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
①.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ccf6769201c55ae5ae826d00f8bcfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab82a9c913753411e77ca39282192441.png)
②.若O为坐标原点,且动点P满足:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323425fb46a89bf5305ee1c2d700de5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
③.设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6d8a4cf957865fad1cb648fcd2cbaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed7b255e6a8bb6fd15cc744d35786b37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78bcedf33c8b82facbef6cd87a2d3a88.png)
④.设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5292a8e4c2c929876c42c9cfabf1244f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0203b006524305c3d8ee0b6c34cd872b.png)
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名校
解题方法
7 . 已知圆
与圆
,在下列说法中:
①对于任意的
,圆
与圆
始终相切;
②对于任意的
,圆
与圆
始终有四条公切线;
③
时,圆
被直线
截得的弦长为
;
④
分别为圆
与圆
上的动点,则
的最大值为4
其中正确命题的序号为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f1dc81fb995b3023d56f82ff964a30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61a2314d1f465b9940f08e0b5f55f88a.png)
①对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fe211e0dea7a44863e5e1706633c3aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211b9e53e4677ae9e2b20d5f7ce0a4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a52e26180930ad5b56a8a45f28a0f2.png)
②对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fe211e0dea7a44863e5e1706633c3aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211b9e53e4677ae9e2b20d5f7ce0a4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a52e26180930ad5b56a8a45f28a0f2.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee117579f5fc3944bbf7f342f50e450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211b9e53e4677ae9e2b20d5f7ce0a4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/601d4c79cdabd1a49a6b8e6d026e663f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef812f839622326a7d7027cc806aaeb.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b09e2d46f94b9ca3caf3f8283619c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211b9e53e4677ae9e2b20d5f7ce0a4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a52e26180930ad5b56a8a45f28a0f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2a0f156c21a6d3387e9c5a15b373d1.png)
其中正确命题的序号为
您最近一年使用:0次
2022-10-13更新
|
975次组卷
|
8卷引用:四川省成都七中2019-2020学年高一下学期6月考试数学试题
8 . 已知函数
和
,若
,现有下列4个说法:①
;②
;③
;④
.其中所有正确说法的序号为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9cc7f5b6853e3e6d0b8ba16ea81edc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9963dcc20d9a6467213797e65f947426.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23b2604e5f8be78fbe6cafcb9b7f2f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/419504736c4934f6e0df4114c3743944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a42526840a0fc525571737bed3d1af6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e431fbe9d32c1fb868e4e3d2e1bd81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d9b616bddad1c2d129975b2a3067603.png)
A.①②④ | B.①②③ | C.②③ | D.①③④ |
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2022-07-07更新
|
601次组卷
|
2卷引用:2023届四川省高考专家联测卷(1)数学(文)试题
名校
9 . 如图,在棱长为
的正方体
中,
,
分别为
,
的中点,有以下四种说法:
![](https://img.xkw.com/dksih/QBM/2022/4/14/2958049529307136/2958818150686720/STEM/a716e0ce-ac0f-4111-ba4c-8aacf0d4c6d3.png?resizew=170)
①直线
与
的夹角为
;
②二面角
的正切值是
;
③经过三点
,
,
截正方体的截面是等腰梯形;
④点
到平面
的距离为
;
则正确命题的序号为_____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2022/4/14/2958049529307136/2958818150686720/STEM/a716e0ce-ac0f-4111-ba4c-8aacf0d4c6d3.png?resizew=170)
①直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
②二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213d25b5ade550ec6afd3536e9eb5d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
③经过三点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
④点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae7f4612c548b1f72a964ddb291cd2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
则正确命题的序号为
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2022-04-15更新
|
340次组卷
|
2卷引用:四川省攀枝花市第七高级中学校2021-2022学年高三上学期入学考试理科数学试题
名校
10 . 已知四边形
为矩形,
,
为
的中点,将
沿
折起,得到四棱锥
,设
的中点为
,在翻折过程中,得到如下有三个命题:
①
平面
,且
的长度为定值
;
②三棱锥
的最大体积为
;
③在翻折过程中,存在某个位置,使得
.
其中正确命题的序号为__________ .(写出所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc28e69c1ba0aac981256887f7dfa94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e1e88b36ff71fe69c07bade0f95f1ef.png)
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①
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②三棱锥
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③在翻折过程中,存在某个位置,使得
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其中正确命题的序号为
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2019-08-02更新
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17卷引用:四川省南充高级中学2020-2021学年高二上学期第二次月考数学(文)试题
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