1 . 已知实数
满足
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870181debcce0e7dab66e560e775ba83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf5cbb1229b387f274eca0fc2854778e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2 . 已知随机变量ξ满足P(ξ=0)=
,P(ξ=1)=x,P(ξ=2)=
-x,则当
在
内增大时,( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fcec77177443519207ffc6afb988d0.png)
A.E(ξ)增大,D(ξ)增大 | B.E(ξ)减小,D(ξ)增大 |
C.E(ξ)减小,D(ξ)减小 | D.E(ξ)增大,D(ξ)减小 |
您最近一年使用:0次
2021-11-06更新
|
411次组卷
|
5卷引用:2019年浙江省绍兴市柯桥区普通高校招生全国统一考试数学方向性试题
2019年浙江省绍兴市柯桥区普通高校招生全国统一考试数学方向性试题 浙江省浙北四校2020届高三下学期二模数学试题(已下线)第53讲 离散型随机变量及其分布列-2021年新高考数学一轮专题复习(新高考专版)(已下线)专题15 随机变量的分布列与期望 -备战2021年新高考数学纠错笔记 (已下线)7.3.2离散型随机变量的方差 (分层作业)-【上好课】高二数学同步备课系列(人教A版2019选择性必修第三册)
名校
解题方法
3 . 一个几何体的三视图如图所示(单位:
),则此几何体的体积(单位:
)是( )
![](https://img.xkw.com/dksih/QBM/2021/10/12/2827861522194432/2833521877344256/STEM/b0881ffb7aa64580a001dfadead20733.png?resizew=366)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6d1d99afa158b4ba4fc0dae562fcc1.png)
![](https://img.xkw.com/dksih/QBM/2021/10/12/2827861522194432/2833521877344256/STEM/b0881ffb7aa64580a001dfadead20733.png?resizew=366)
A.12 | B.24 | C.36 | D.72 |
您最近一年使用:0次
2021-10-27更新
|
751次组卷
|
2卷引用:2018年浙江省普通高校招生全国统一考试方向性考试数学试题
4 . 已知
,
,
,
,
,则
的最大值是( )
![](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/4f8e68eb4ade6e22982d2df5102d8894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c4f95aea9fca73fa494397f0aa961b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0489f7bfff48a6d14a9d6b8ad0163fd.png)
A.4 | B.8 | C.16 | D.32 |
您最近一年使用:0次
名校
5 . 已知数列
,
都是等差数列,数列
满足
.若
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a704404ab8fa98e939043122e12c4ba6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e42e1961482c32d10aa1b3ba12a6d0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92968a1ebdce6562a5a62c558055133b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1597f20c29fb74afddb59484c4d39832.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff3d7725cc46e7d5bcc209645a076f1.png)
A.28 | B.56 | C.72 | D.90 |
您最近一年使用:0次
2021-10-22更新
|
490次组卷
|
2卷引用:2018年浙江省普通高校招生全国统一考试方向性考试数学试题
解题方法
6 . 已知向量
、
满足
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd18461fd9d77e6fa46a654f0ab540f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976441c67d611a82b362bb7f2f50c581.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
7 . 已知
,
,则“
且
”是“
”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54dad48527a47eab4a5916ab0421cc71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2671a54305f2aedce64f0d015c2fcaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ad3787d3114552e221899f4699d9ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d06113715f480fc2cae63a525b16d175.png)
A.充分而非必要条件 | B.必要而非充分条件 |
C.充分必要条件 | D.即不充分也不必要条件 |
您最近一年使用:0次
8 . 一袋中有6个白球,3个红球,现从袋中往外取球,每次任取一个记下颜色后放回,直到红球出现10次时停止,设停止时共取了
次球,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e2157c8defdc14f3180efa38b6471f.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
名校
9 . 双曲线
的渐近线方程是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88cd6780729ed71bbf3457ae2b82af7c.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2021-10-22更新
|
989次组卷
|
6卷引用:2018年浙江省普通高校招生全国统一考试方向性考试数学试题
解题方法
10 . 若实数
,
满足
,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/720172764a556ed6f43b1619152f2ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cf99adccc80f28343fedd8d0aad7429.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次