名校
1 . 在等差数列
中,
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f657d39c6ca02f641b0e84b2ae684a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27c4740129f15112fd1d0b838f61e9b2.png)
A.1 | B.2 | C.3 | D.4 |
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2 . 已知5个成对数据
的散点图如下、若去掉点
,则下列说法错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d9aa1d34d66a6876aa0566c8fc8b0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0832865807b6b82f14ca186a84ca50a2.png)
A.变量x与变量y呈负相关 | B.变量x与变量y的相关性变强 |
C.残差平方和变小 | D.样本相关系数r变大 |
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解题方法
3 . 已知等差数列
的前
项和为
,
,
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afbfd6b761451716ba3d7130c93497ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3cf6f2bbe20a404fea41a4d2b1c4c7.png)
A.70 | B.80 | C.90 | D.100 |
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4 . 函数
在
上的平均变化率是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ac0c8534a33458bb3143bd89956e9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779c078e850ff40330d7b3b98a402dd2.png)
A.![]() | B.8 | C.![]() | D.![]() |
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5 . 下列选项中,结果为正数的有( )
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
6 . 将函数
的图象向右平移
个单位长度后,得到函数
的图象,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab30dbecfb6ccd327bd1c646509e10ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf8193aaa40bcd8a82e71b49a673256.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f46a13297035069791fec890b2d7f7b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
7 . 已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7183b12510167f930fc59084add0601f.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c823ace231970b1608da2795d4794fd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3744ee15af01a8e7c0f126edb5f68132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7183b12510167f930fc59084add0601f.png)
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8 . 已知椭圆
(
)与椭圆
有相同的焦点,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9275348551df51890daba053acf6293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6205da5e1d2730ee0b3de8bca3e29f5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
A.![]() | B.![]() | C.3 | D.4 |
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解题方法
9 . 已知集合
,
,则
子集的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36113af7d0b0b4cf823babb95fb7536d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49a13986303f07ea1b5b9c0f10e8897f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdbfa7a63fdf5717d40c8c9a73ec160.png)
A.4 | B.8 | C.15 | D.16 |
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解题方法
10 .
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e202b9804b62714eae1c1618f0219e9.png)
A.![]() | B.![]() | C.![]() | D.1 |
您最近一年使用:0次