名校
1 . 某小学举办家长开放日,欢迎家长参加活动,小明母亲参加活动的概率为
,若母亲参加,则父亲参加的概率为
;若母亲不参加,则父亲参加的概率为
,请问小明父亲参加活动的概率为______ ;在已知小明父亲参加活动的条件下,母亲参加的概率为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d41840af35e218a5639a2eff4d80b54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f558992e649b93ee36f37513781311a8.png)
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2 . 已知空间四边形
(见图),其各边及其对角线
的长都是6,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
______ ,
的长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f507bf0c5f7512f06ce914364a8cba63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d74b1d0480790400a9223e4437afdba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d15c0019755c6b86d56f191d311c34da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/933cf4d91008779cec543cc771fd9593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
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解题方法
3 . 已知
的展开式的二项式系数之和为32,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
______ ;各项系数之和为______ .(用数字作答)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b9d041df054ebf5d44b699ba334593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
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解题方法
4 . 已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98070d8ebddca2ff730d7444e18a79c2.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/899098f4ae1bf3e3697526ee4c508ded.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/875dc66b71841e1e36c774ae9d47fdb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98070d8ebddca2ff730d7444e18a79c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/899098f4ae1bf3e3697526ee4c508ded.png)
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解题方法
5 . 已知正数
满足
,则当
取得最小值时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
_______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9615fb005e74640174d0f55e4a18476.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b7e12253044b5abff2a56dcd730ced8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
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6 . 已知全集
,集合
,集合
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0138bfb7407fc0af212dc439d705cfb3.png)
_______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e60375f97ff7854f4d3a8b1108d2e3.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f712c090c0ee3236ec7e9ddba42e960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea88acab872f6ba76c8c092e114b63f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73bdbc9e0aa626fff7241e707e67575c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0138bfb7407fc0af212dc439d705cfb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e60375f97ff7854f4d3a8b1108d2e3.png)
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23-24高二下·江苏·期末
解题方法
7 . 已知随机变量X的分布列为则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
________ ;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/981a1cde2aefb846d30f461a39a1d062.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/981a1cde2aefb846d30f461a39a1d062.png)
X | 0 | 10 | 100 |
P | 0.81 | ![]() | 0.09 |
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8 . 如图所示:在一个无限延展的平面上,铺满了边长为1的正方形网格,已知某质点从
出发,只能沿着网格线走,每次走一格,且每次向右走的概率为
,向上走的概率为
,向左走的概率为
,向下走的概率为
,且每一步之间相互独立.若要求质点按最短路径从
到达
,则可能的不同路径有__________ 条(用数字作答);设按最短路径从
到达
的概率记为
,则当
取得最大值的时候
的取值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21198c85acf9672fafcfaa094de88342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b29d292eaa8743e4f534d4c85e999c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a0be4eebc5d70c51f72f28dbfc11e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a0be4eebc5d70c51f72f28dbfc11e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
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解题方法
9 . 某企业生产的金属棒的长度
(单位:
)近似的服从正态分布
,则长度
的期望![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46557218223e514bca65d845b5b01800.png)
__________ :随机抽取1万根金属棒,长度在
(单位:
)的金属棒大约有_______________ 根.(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/653cd7ab2153714397254a00075dbcec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46557218223e514bca65d845b5b01800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84dffe0d75b132d2692fbdfcad5fd350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9078b7cddb3e6a8512233b4e7eab8cdd.png)
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10 . 圆上有5个点,过每3个点画一个圆内接三角形,则一共可以画出______ 个圆内接三角形;请编写一个排列数的问题,其答案为
,这个问题可以是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf27fcb6f5bd1bb02754526649b3bce2.png)
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