题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065942-79907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065942-94908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065943-88153.png)
(2)通过观察上述各式的计算规律,请你写出一般性的命题,并给出的证明
(参考公式:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065943-52809.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065942-79907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065943-12351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065942-94908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065943-12351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065943-88153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065943-12351.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065943-11575.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065944-25479.png)
然后利用三角函数关系式给出证明
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065944-67885.png)
解:(1)试计算下列各式:(只需写出计算结果,不需写出计算过程)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065944-54515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065943-12351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065942-94908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065943-12351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065943-88153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065943-12351.png)
(2)通过观察上述各式的计算规律,请你写出一般性的命题,并给出的证明
一般性的命题:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065945-29755.png)
略证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065945-28420.png)
核心考点
试题【(本题满分15分)(1)试计算下列各式:(只需写出计算结果,不需写出计算过程)____________________________________(2)通过】;主要考察你对合情推理与演译推理等知识点的理解。[详细]
举一反三
把正整数按从小到大顺序排列成下列数表,数表中第
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065926-32936.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065926-39988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065926-95719.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065926-77758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065926-32936.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065927-19483.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065927-54260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065927-88252.png)
(2)记
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065927-87583.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065928-98135.png)
(3)猜想
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065928-78954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065928-38954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065917-20657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065917-55109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065917-81523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065918-41165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065918-41165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065917-55109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065918-45468.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065918-53000.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065918-37550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065918-66807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065917-55109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065919-60293.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065919-38686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065919-38686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065917-55109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065919-73843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065919-33472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065914-73659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065906-75113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065906-80680.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065906-75113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065906-52038.png)
有如下运算和结论:①
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065906-53537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065907-16773.png)
数列;③数列
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065907-86153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065907-21910.png)
存在正整数
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065907-78954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106065908-21068.png)
为正确的结论序号都填上)
A.由数列![]() ![]() |
B.平面内不共线的三点确定一个圆,由此猜想空间不共面的三点确定一个球 |
C.垂直于同一平面的两条直线平行,又直线![]() ![]() ![]() |
D.由![]() ![]() |
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