1 . 已知△
为等腰直角三角形,且
.给出下列结论:
①
;
②|
;
③
;
④
.
其中正确结论的序号为________ .(写出所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19e54071a8df06f3b7ca62cb99c1c9d7.png)
②|
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a5f9ff868a122cbc8c2a5d20ce663d3.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfc83f4955870b1de9b5997313afbb41.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3946b9e2e8ec61d4252d47f056fa7697.png)
其中正确结论的序号为
您最近一年使用:0次
2022-04-25更新
|
262次组卷
|
2卷引用:北京市房山区2021-2022学年高一下学期期中学业水平调研数学试题
2 . 数列
为1,1,2,1,1,3,1,1,1,1,4,…,前n项和为
,且数列
的构造规律如下:首先给出
,假若复制前面为1的项,再添加1的后继数为2,于是
,然后复制前面所有为1的项,1,1,再添加2的后继数为3,于是
,接下来再复制前面所有为1的项,1,1,1,1,再添加3的后继数为4,…,如此继续.现有下列判断:
①
; ②
;
③
; ④
.
其中所有正确结论的序号为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b11082835255e4054151694c77331b28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e413cc989b74e0949abaa7182b504833.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5afcdc771dcbf3b0d48e10fd13a2b55c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af67926e775e11fb8bdded1e9cd3f9aa.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ebe8f8acaedc520ea1db0bbfe7973a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7842381350e30ad2a539323ec2edfbe7.png)
其中所有正确结论的序号为
您最近一年使用:0次
3 . 已知曲线F(x,y)=0关于x轴、y轴和直线y=x均对称,设集合S={(x,y)|F(x,y)=0,x∈Z,y∈Z}.下列命题:
①若(1,2)∈S,则(-2,-1)∈S;
②若(0,2)∈S,则S中至少有4个元素;
③S中元素的个数一定为偶数;
④若{(x,y)|y2=4x,x∈Z,y∈Z}⊆S,则{(x,y)|x2=-4y,x∈Z,y∈Z}⊆S.
其中正确命题的序号为______ .(写出所有正确命题的序号)
①若(1,2)∈S,则(-2,-1)∈S;
②若(0,2)∈S,则S中至少有4个元素;
③S中元素的个数一定为偶数;
④若{(x,y)|y2=4x,x∈Z,y∈Z}⊆S,则{(x,y)|x2=-4y,x∈Z,y∈Z}⊆S.
其中正确命题的序号为
您最近一年使用:0次
2019-04-26更新
|
573次组卷
|
3卷引用:【区级联考】北京市房山区2019年高考第一次模拟测试数学(理科)试题
解题方法
4 . 某同学在研究函数
时,得到以下几个结论:
①函数f(x)是奇函数;
②函数f(x)的值域是[﹣1,1];
③函数f(x)在
上是增函数;
④函数g(x)=f(x)﹣m(m是常数)必有一个零点.
其中正确结论的序号为_____ .(写出所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/859867e84526f7607c4f67e252c26cb3.png)
①函数f(x)是奇函数;
②函数f(x)的值域是[﹣1,1];
③函数f(x)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
④函数g(x)=f(x)﹣m(m是常数)必有一个零点.
其中正确结论的序号为
您最近一年使用:0次
5 . 以下三个关于圆锥曲线的命题:
①设
,
为两个定点,
为非零常数,若
,则动点
的轨迹为双曲线;
②方程
的两根可分别作为椭圆和双曲线的离心率;
③双曲线
与椭圆
有相同的焦点.
其中真命题的序号为_____ (写出所有真命题的序号).
①设
![](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/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d7a3544be6797ded92aa786853fec8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
②方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67f9da93ffb16e3e15db5eb0b7a3618d.png)
③双曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6d49e09b17b19d7c787e95bcf1e9731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06b1ddc7d49161e0eb8cecdab16285d4.png)
其中真命题的序号为
您最近一年使用:0次
解题方法
6 . 声音是由于物体的振动产生的能引起听觉的波,我们听到的声音多为复合音.若一个复合音的数学模型是函数
,给出下列四个结论:
①
的一个周期为
;
②
的图象关于原点对称;
③
的最大值为
;
④
在区间
上有
个零点.
其中所有正确结论的序号为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c40150a4c49bb8fd623d9ca9a2e925d.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e2d7c958e99bcd9d7f251c19ee3544.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bccd6a6e85bdf500218a3e75b31f3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
其中所有正确结论的序号为
您最近一年使用:0次
名校
解题方法
7 . 在正方体
中,
为棱
上的动点,
为线段
的中点.给出下列四个结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/11/728f8e20-d71a-4a9d-af5a-2f992985d287.png?resizew=160)
①
;
②直线
与平面
的夹角不变;
③三棱锥
的体积不变;
④点
到
,
,
,
四点的距离相等.
其中,所有正确结论的序号为_____________________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9601d29de0a884953b039ee72f0158fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/11/728f8e20-d71a-4a9d-af5a-2f992985d287.png?resizew=160)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3681ff426cdbe7184eeb004ff0eaefb.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557f8ff92d79a9d464ff13de17f3eae7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdcfe69b939fd1c271747fe9d37ccdf9.png)
③三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc3bf74119692ac98eb24fcfa2a3f9f.png)
④点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
其中,所有正确结论的序号为
您最近一年使用:0次
名校
解题方法
8 . 如图,正方体
的棱长为1,
分别是棱
,
的中点,过点
的平面分别与棱
,
交于点
,给出以下三个命题:
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975744314245120/2976567741620224/STEM/4875bb79-358e-43e3-94de-deb81be67742.png?resizew=163)
①四边形
的面积的最大值为
;
②四边形
的面积的最小值为1;
③四棱锥
的体积为定值
.
其中正确命题的序号为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0f3ed5ea1cf0fa8f7c6be46cd5fa057.png)
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975744314245120/2976567741620224/STEM/4875bb79-358e-43e3-94de-deb81be67742.png?resizew=163)
①四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/839c7616cd0d90265f4b2c9c021254fe.png)
②四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
③四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11719e323e73b9512869d6aca6aaae75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6486784415f3537c9a13556c05d893.png)
其中正确命题的序号为
您最近一年使用:0次
2022-05-10更新
|
441次组卷
|
2卷引用:北京市良乡附中2022-2023学年高一6月月考数学试题
9 . 定义在区间
上的连续函数
,如果
,使得
,则称
为区间
上的“中值点”,下列函数:
①
;②
;③
;④
中,在区间
上“中值点”多于一个的函数序号为__________ .(写出所有满足条件的函数的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/253f151ce30bbf38127910a39d134c19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a1ebea8ae294b4009e703414fe49e8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfc8affebde04424fd3e677e38a4dde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0bc4f7ba817dca32178b65d9aab5c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e96546b3259afe4add331673fb835c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1319a9ca9b237a6be4d7b7e5c1aa1d79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e11f4ca0e7ace69f92130d0525bcdb3.png)
您最近一年使用:0次
2017-11-01更新
|
491次组卷
|
4卷引用:北京市房山区良乡中学2023届高三上学期期中数学试题
10 . 如图1,在
△
中,
,
,
,
,
分别是
,
上的点,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
,
,将△
沿
折起,使
到
,得到四棱锥
,如图2.在翻折过程中,有下列结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/f6eb2b3e-0e94-4ba7-8aa7-9a110ad72230.png?resizew=256)
①
平面
恒成立;
②若
是
的中点,
是
的中点,总有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
平面
;
③异面直线
与
所成的角为定值;
④三棱锥
体积的最大值为
.
其中正确结论的序号为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7eccdc904f71a7a6a02134f47e08072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f16a2e7a3504575ae0129516710ec938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8cf5ceb2fd2673fc86bf93c02be562a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/f6eb2b3e-0e94-4ba7-8aa7-9a110ad72230.png?resizew=256)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4525d2a5cfdd4c82f62c28177d6cf9.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
③异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
④三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb0b2ee77d53ce59cbc2b17693a2261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a391005600bdd69c96750589f9adb048.png)
其中正确结论的序号为
您最近一年使用:0次
2021-08-01更新
|
288次组卷
|
3卷引用:北京市房山区2020-2021学年高一下学期期末数学试题
北京市房山区2020-2021学年高一下学期期末数学试题北京市北京师范大学第二附属中学2022届高三上学期期中考试数学试题(已下线)第二章 立体几何中的计算 专题六 空间定值问题 微点6 空间定值问题综合训练【培优版】