1 . 若方程
表示椭圆,则实数
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea7090c4797cc0b4517b0c5f1d87cdae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() | C.![]() | D.![]() ![]() |
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2 . 设
为两个事件,已知
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e0db7b872faffe9e898d4104c247d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827240d4145c0d90a775e273ffb08fcb.png)
A.0.1 | B.0.2 | C.0.4 | D.0.6 |
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解题方法
3 . 由
,
,
,
可以组成多少个没有重复数字的三位数( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
A.12 | B.24 | C.18 | D.21 |
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4 . 如图,一个三棱柱形容器中盛有水,侧棱
.若侧面
水平放置时,水面恰好过
,
,
,
的中点.那么当底面
水平放置时,水面高为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac5e1093a147c521c5e8d0d5e266db54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
A.7 | B.6 | C.4 | D.3 |
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解题方法
5 . 从
,
,
,
,
这五个数字中任取3个,从2,4,6,8这四个数中任取2个,组成数字不重复的五位数的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d02ea8c4988c5c28ab93f0d70fb55a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
6 . 北京2022年冬奥会吉祥物“冰墩墩”和冬残奥会吉祥物“雪容融”一亮相,好评不断,这是一次中国文化与奥林匹克精神的完美结合.为了宣传2022年北京冬奥会和冬残奥会,某学校决定派小明和小李等5名志愿者将两个吉祥物安装在学校的体育广场,每人参与且只参与一个吉祥物的安装,每个吉祥物都至少由两名志愿者安装.若小明和小李必须安装不同的吉祥物,则不同的分配方案种数为( )
A.8 | B.10 | C.12 | D.14 |
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7 . 函数
的单调递减区间是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be0ef42fcac290f927d7df36d4a52a5.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
解题方法
8 . 某科研院校培育大枣新品种,新培育的大枣单果质量近似服从正态分布
(单位:
),现有该新品种大枣
个,估计单果质量在
范围内的大枣个数约为( )
附:若
,则
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1eca4bdf2948c3a38d74e30093f426.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3960d67499df76159982657fe3a1cbca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1926eb08a21a8b6558fcfd4c52a4a23b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3ed24750a87ae179c71c76c4a3f88ec.png)
附:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c1ed67167078ea4f5f1ee53ee14164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a73c92c442a142d4e5fc618dc00bcf30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b65e903fb7fe549c73f55779df19729f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/112b77b25edccc41e2253c5b779d107e.png)
A.8186 | B.8400 | C.9545 | D.9759 |
您最近一年使用:0次
9 . 已知正三棱锥的底面边长为4,侧棱长为8,则三棱锥的体积为( )
A.![]() | B.![]() | C.![]() | D.![]() |
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10 . 已知函数
(e为自然对数的底数),且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450a0d98df0084f3519d02805fb7ad56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee14240604cfac93453bddcebb8ee4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2796868fcd26d2a8558666fe46494541.png)
A.2024 | B.![]() | C.2022 | D.![]() |
您最近一年使用:0次