名校
1 . 斐波那契数列是数学史上一个著名数列,它是意大利数学家斐波那契在研究兔子繁殖时发现的,若数列
满足
,
,
,则称数列
为斐波那契数列,该数列有很多奇妙的性质,如根据
,可得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5715b6dd77450463a72af9e036876c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4298da4fe1842b8cc2299dee1fc1e9f8.png)
,类似的,可得
( )
![](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/f966272f7781790ff27e40db6b525253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316b5d6779890069e877f081d1833883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/318e1198387d90072efab703a2ed24a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5715b6dd77450463a72af9e036876c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4298da4fe1842b8cc2299dee1fc1e9f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ab02aa8b890c41f0644018ab5059b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a42bf70f9ddd3bd56826feb7c96090b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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9-10高三·宁夏银川·阶段练习
2 . 在
中,两直角边分别为
、
,设
为斜边上的高,则
,由此类比:三棱锥
中的三条侧棱
、
、
两两垂直,且长度分别为
、
、
,设棱锥底面
上的高为
,则 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87fd28b8b2bde9de5630a6106a6f762e.png)
![](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/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d2bea549acd4547e6fbf74b466fa39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](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/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
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2016-11-30更新
|
1129次组卷
|
5卷引用:2010-2011年河南省许昌市高二下学期联考数学理卷
(已下线)2010-2011年河南省许昌市高二下学期联考数学理卷(已下线)2011届宁夏银川二中高三第一次月考理科数学卷(已下线)2012-2013学年广东省东莞市第七高级中学高二3月月考理科数学试卷上海市浦东新区2017届高三上学期期中联考数学试题江苏省苏州市外国语学校2018-2019学年高二下学期期中数学(文)试题
10-11高二下·河南许昌·期末
3 . 以下说法中正确的是
① 甲乙两同学各自独立地考查了两个变量
的线性相关关系时,发现两个人对
的观测数据的平均值相等,都是
,对
的观测数据的平均值也相等,都是
,各自求出的回归直线分别是
,则直线
必定相交于定点
.
②用独立性检验(2×2列联表法)来考查两个分类变量
是否有关系时,算出的随机变量
的值越大,说明“
有关系”成立的可能性越大.
③合情推理就是正确的推理.
④最小二乘法的原理是使得
最小.
⑤用相关指数
来刻画回归效果,
越小,说明模型的拟合程度越好.
① 甲乙两同学各自独立地考查了两个变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa0010cb466163db1349fc1040f6b439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5823e0c6dd1b7a6ff42d4ff521cc0366.png)
②用独立性检验(2×2列联表法)来考查两个分类变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa0010cb466163db1349fc1040f6b439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2581192317ef233ccdccfc48ac29b52b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa0010cb466163db1349fc1040f6b439.png)
③合情推理就是正确的推理.
④最小二乘法的原理是使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa4642b7ba5a4d1b93e601439c391e1.png)
⑤用相关指数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
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