2020·全国·模拟预测
解题方法
1 . 已知数列
:1,1,2,3,5,…其中从第3项起,每一项都等于它前面两项之和,则数列
的前7项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf14ebc775db2414a5a960badca8960.png)
_____ ;若
(
),则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e50e4f46c807aa021efb4f8bfff8a2f.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf14ebc775db2414a5a960badca8960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76689bcda4b209fd5b3d0465698ec53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd8aee054e0ad91e23829b78f2e53aa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e50e4f46c807aa021efb4f8bfff8a2f.png)
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2020·全国·模拟预测
名校
2 . 已知直线
:
与圆
:
,当直线
与圆
相切时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
______ ;当直线
截圆
所得的弦最长时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16b039dc5a1d9632cc44a6c7c149b3aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f308668d4851884b03c3475dff4ef65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
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2020·全国·模拟预测
3 . 现有5张完全一样的纸牌(有正反面之分)放在桌面上,初始状态是3张纸牌正面朝上,2张纸牌正面朝下,若每次只能随机翻一张纸牌,记
表示第
次翻纸牌后正面朝上的纸牌数,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b71126660ed98a16198dd4a54b6e6bc4.png)
________ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825b93b3fc2042cc4a31976d81075b96.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c9975b7cb327da8634aabab7856095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b71126660ed98a16198dd4a54b6e6bc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825b93b3fc2042cc4a31976d81075b96.png)
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2020·全国·模拟预测
解题方法
4 . 已知抛物线
的焦点
到抛物线上的点
的距离为3,则点
的坐标为________ ,
(其中
为坐标原点)的面积为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7ad3432ac96b0a38beaa7f2edc3499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79c71c49dc9a9de1a0221769e4eb8616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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5 . 在
中,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd08cfa103788811e6d78f326e1d5cf.png)
________ ,向量
与
的夹角的大小为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b19819443514c14e3133a657941198.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03b93bf1e37d4b54e74b6504deccdee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1029d57b9dfac845964e4f173a6d8c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd08cfa103788811e6d78f326e1d5cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be64d59ac6538a0f4d79fb825e082081.png)
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2020·全国·模拟预测
6 . 已知
的所有二项式系数之和为64,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
________ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784a5b34eeb467bd68c7a3d1531136ab.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/044997d1930f3eec9eb2ba8b182e11fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784a5b34eeb467bd68c7a3d1531136ab.png)
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2020·全国·模拟预测
解题方法
7 . 如图是某几何体的三视图,其中网格纸上小正方形的边长为1,则该几何体的体积为______ ,表面积为______ .
![](https://img.xkw.com/dksih/QBM/2021/1/12/2634688619659264/2635464134008832/STEM/d09f3c4596404341aad03c0fcbdb371f.png?resizew=160)
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2020·全国·模拟预测
解题方法
8 . 已知
的展开式中所有项的系数和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
______ ,展开式中的常数项为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42021a384e494638a9964691f44b1b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ebb51ff653764e0f964cf4ecda0199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
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2020·全国·模拟预测
9 . 已知离散型随机变量
的分布列为
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac87b4bd71432d757c7b78bbd6b2dcfd.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc23dc1709498e8920d7d243213190b2.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
1 | 2 | 4 | |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac87b4bd71432d757c7b78bbd6b2dcfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc23dc1709498e8920d7d243213190b2.png)
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2020·全国·模拟预测
解题方法
10 . 在锐角三角形
中,内角
,
,
所对的边分别为
,
,
,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ccf80920d47882d6d43bbd8c40bc33.png)
______ ,
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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/c5db41a1f31d6baee7c69990811edb9f.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/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b138b04e4f38a566d3e2e93d4f27ca25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ccf80920d47882d6d43bbd8c40bc33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88050fbeab0faab61d7d36ff148c6cb1.png)
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