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二项式
的展开式的常数项是___________.
设函数

.
(1)求

图象上点

处的切线方程;
(2)若

在

时恒成立,求

的取值范围;
(3)若

,证明

.
已知数列

是公比大于0的等比数列.其前

项和为

.若

.
(1)求数列

前

项和

;
(2)设

,

,其中

是大于1的正整数.
(ⅰ)当

时,求证:

;
(ⅱ)求

.
已知椭圆

椭圆的离心率

.左顶点为

,下顶点为

是线段

的中点,其中

.
(1)求椭圆方程.
(2)过点

的动直线与椭圆有两个交点

.在

轴上是否存在点

使得

恒成立.若存在求出这个

点纵坐标的取值范围,若不存在请说明理由.
已知四棱柱

中,底面

为梯形,

,

平面

,

,其中

.

是

的中点,

是

的中点.

(1)求证

平面

;
(2)求平面

与平面

的夹角余弦值;
(3)求点

到平面

的距离.
若函数

有唯一零点,则

的取值范围为
______.
在边长为1的正方形

中,点

为线段

的三等分点,

,则
______;若

为线段

上的动点,

为

中点,则

的最小值为
______.
