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1 . 若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60a06f6d8a62020785155cb91212e72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ba4099214de730a5f4c322d4e1310b7.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
2 . 已知双曲线
的左焦点为
,过坐标原点
作直线与双曲线的左右两支分别交于
两点,且
,
,则双曲线的渐近线方程为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb68e77dc3ec2fa402a45d26e63e742.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4f790388df7f2f28e56ce19c2c84f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b98e91240001ff3210f3b9fc67adb7.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 .
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed88494a1c51daa92014abbc34c266e.png)
_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed6448f66b2aef8c9685ce56054a160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed88494a1c51daa92014abbc34c266e.png)
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4 . 已知集合
,则下列关系正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07dceaa9d2b54322c0dc3fd0715ed61b.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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5 .
是
的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d7451b31c533a10776276da08717f20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c8f4e5bcddf3cb2591af7dcf0867df1.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
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6 . 已知等比数列
的首项为1,公比为
,其前
项和记为
(其中
为非零常数),则数列
的前
项和是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 设
,
,
,则a,b,c的大小关系为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb9fe671dc0ae44a46d3bdb398aaaffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a62b3590ff2f648d629fd0799d1f4743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34f51b6e0abc15f53a0511198a217eab.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 若
展开式中的常数项为
,则实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0dabc2971860d6313a7cb089802b11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72b4cc0ef850fb0fcd51ea490f4f8c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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解题方法
9 . 下列说法正确的是( )
A.样本相关系数可以用来判断成对样本数据相关关系的正负性 |
B.在做回归分析时,残差图中残差比较均匀分布在以取值为0的横轴为对称轴的水平带状区域内,且宽度越窄表示回归效果越差 |
C.若随机事件![]() ![]() ![]() ![]() ![]() ![]() ![]() |
D.若随机变量![]() ![]() |
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