名校
1 . 如图,在四棱锥
中,四边形
为正方形
为等边三角形
分别是
和
的中点.
(1)求证:直线
平面
;
(2)若
求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a7e7211d87f8e44dd5d61ce4f6c8ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29560ed838ea0c239351c94d23945a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/6/abc4db76-cd11-43ef-9739-9420097d6286.png?resizew=142)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d7c56ff7012053b6db5073df693800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422210c777ac0d625bbd81cc7601bf9b.png)
您最近一年使用:0次
名校
解题方法
2 . 在
中,角
的对边分别为
且
若三角形的面积为
且
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
_________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7132c2d8b2ff504e6c2ba36c4f6dcfaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c48d400297f423dafde78aba92a7195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11a10139dcd7321d24dc9f41606203a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4121fecca5afea0ca688575de00923e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
您最近一年使用:0次
3 . 已知抛物线
的焦点为
点
在
上. 若
到直线
的距离为4,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cc141e9b6050eae77c22dd46fd4ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f5c664aa79a88c035d7ece15220a4c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc1c76111ee604ba947ad94a13695a2e.png)
A.7 | B.6 | C.5 | D.4 |
您最近一年使用:0次
名校
解题方法
4 . 已知
,若
.
(1)求实数m的值;
(2)求
;
(3)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/475e86b858a64a40b0ab376742ad44d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e375fc24463eb3f06d73f52a6c96d55.png)
(1)求实数m的值;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d331d6254b8d27ab4f981de26f354398.png)
您最近一年使用:0次
7日内更新
|
248次组卷
|
2卷引用:吉林省长春外国语学校2023-2024学年高二下学期期中考试数学试题
名校
解题方法
5 . 已知
,则数列
的偶数项中最大项为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5352e044fc140578e9eb2166d5e171ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
6 . 已知数列
中,
且
,则
( )
![](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/ca179b51a0cff1f81d951b508a77b3ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e5edade76c845f5e0e5a3aed8af3436.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
7 . 已知数列
是正项数列,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/670579690fc05a060cae7129ff37350f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88a93cd933205ee6a5af0c514e14ca25.png)
A.216 | B.260 | C.290 | D.316 |
您最近一年使用:0次
名校
8 . 数列
,3,
,9
的一个通项公式是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47153fdd73c0661fa460130082e30929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a7c9779f3304d8b9823141f2aeec3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89efcd04701640fd2ea2fd9db2ec21ee.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
名校
9 . 已知函数
.
(1)当
时,求
的图象在
处的切线方程;
(2)若函数
存在单调递减区间,求实数a的取值范围;
(3)设
是函数
的两个极值点,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53ce03991003cf95131016408f2d4ce1.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d06e33d079ac1649ee5eea8f61de7cf.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fcad362a59670d52247deb8af650927.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/648d45539fbee959eabbf7a6c01f6982.png)
您最近一年使用:0次
名校
10 . 以下有关直线拟合效果的说法错误的是( )
A.通过最小二乘法得到的线性回归直线经过样本点的中心![]() |
B.相关系数r越小,表明两个变量相关性越弱 |
C.最小二乘法求回归直线方程,是求使![]() |
D.决定系数R2越接近1,表明直线拟合效果越好 |
您最近一年使用:0次