解题方法
1 . 已知随机变量
的分布列如下,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/514aef3dd8e1fa10b420a03b18a0e376.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/514aef3dd8e1fa10b420a03b18a0e376.png)
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解题方法
2 . 饕餮(tāo tiè)纹,青铜器上常见的花纹之一,盛行于商代至西周早期,最早出现在距今五千年前长江下游地区的良渚文化玉器上.有人将饕餮纹的一部分画到方格纸上,如图所示,每个小方格的边长为1,有一质点从A点出发跳动五次到达点B,每次向右或向下跳一个单位长度,且向右或向下跳是等可能性的,那么质点跳动的路线恰好在饕餮纹上的概率为__________ .
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解题方法
3 . 如图,在三棱柱中
中,
两两互相垂直,
是线段
上的点,平面
与平面
所成锐二面角为
,当
最小时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b0594893c40c5578051097ccad61e0.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c674f6129c22ef714c8e873d1013747d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4298e1f4593f40e98afffb687c03574.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ebf67d880172b27fefacc3c5b808eae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037fb348109dc2063a268b10eb925a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e884ca9429486026caa5e2310b0e4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b0594893c40c5578051097ccad61e0.png)
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4 . 如图是一个正四棱台
,已知正四棱台的上、下底面的边长分别为
和
,体积为
,则此正四棱台的高为__________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a965ef4b938192a74937fcacb7a907f.png)
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解题方法
5 . 已知平行四边形
中,
,
,
.若点
满足
,点
为
中点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f33bd925dbc5bda5c705f6a3400c66c.png)
__________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00dc923e1b4f6a795bfd70cd698dfdd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7872abd162e356132bb371fc581d818c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c3a1f1a37e69b2dc06bf0affd58f22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a06d84898e2aed657ca46546f870c304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f33bd925dbc5bda5c705f6a3400c66c.png)
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6 . 定义
.若向量
,向量
为单位向量,则
的取值范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10bbbb610020a2eb32b97723f7b0b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ebc66da1dde88ac316db58aeac7738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/516834df4d567c6d385afd6b44860ebc.png)
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7 . 乒乓球(table tennis),被称为中国的“国球”,是一种世界流行的球类体育项目.已知某次乒乓球比赛单局赛制为:两球换发制,每人发两个球,然后由对方发球,先得11分者获胜,若单局比赛中,甲发球时获胜的概率为
,甲接球时获胜的概率为
,甲先发球,则单局比赛中甲
获胜的概率为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3407dcd0e695d2f6e1cfac0a99c4f7.png)
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8 . 存在过点
的直线与曲线
相切,则实数
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b119d0cf10a948cdc53c1066af0b8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6454a912d65423ed04506f1d791d866e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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9 . 若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38dd8aad9cfb5e1fe2a45d80923f1571.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/046387911745f43ff3b6804ea58eb26a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d718077f631a1509ada814ab784c8087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38dd8aad9cfb5e1fe2a45d80923f1571.png)
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10 . 5和45的等比中项是_________________ .
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