题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212320-12407.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-62410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-69687.gif)
(Ⅰ)如果
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212320-12407.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-62410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-62410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-69687.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-87650.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212320-12407.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-62410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-69687.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-87650.gif)
(Ⅱ)如图,如果
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212320-12407.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-62410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-62410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-69687.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-87650.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212320-12407.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-62410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-69687.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-56083.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-69687.gif)
(Ⅲ)如果边长为2的正三角形
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-87650.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212320-12407.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-62410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-69687.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212320-12407.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-62410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-44919.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-62410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-69687.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212322-80404.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212322-24701.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212322-36836.jpg)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212322-19822.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-62410.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-62410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212323-50594.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212323-33148.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212323-96986.gif)
∴边长
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212323-26521.gif)
(Ⅱ)设边长为
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212323-24694.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-56083.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212321-69687.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212324-39603.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212324-53301.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212324-11474.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212324-10931.gif)
两式相比得:
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212324-29282.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212325-74160.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212325-28466.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212325-85781.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212325-69919.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212326-28153.gif)
(Ⅲ)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212322-24701.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212326-75913.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212326-79976.gif)
=
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212326-19803.gif)
=
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212326-47509.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212327-68233.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212327-84217.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212327-49917.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212327-30644.gif)
核心考点
试题【已知、、是同一平面内三条不重合自上而下的平行直线.(Ⅰ)如果与间的距离是1,与间的距离也是1,可以把一个正三角形的三顶点分别放在,,上,求这个正三角形的边长;(】;主要考察你对任意角三角函数的概念等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212208-67635.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212208-67635.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212208-81907.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212208-74444.gif)
(ⅰ)试将
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212209-85232.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212209-30753.gif)
(ⅱ)求
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212209-85232.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212201-36410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212201-26646.gif)
(Ⅰ)试将水槽的最大流量表示成关于
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212201-74985.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212201-88739.gif)
(Ⅱ)求当
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212201-74985.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212201-24269.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212111-85637.gif)
(Ⅰ)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212113-15463.gif)
(Ⅱ)设A,B,C为
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212113-74766.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212114-67971.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212114-38214.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212045-79237.gif)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既非充分条件也不是必要条件 |
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212038-46389.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212038-22534.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212038-91241.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212039-97025.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212039-90743.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212039-25058.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212040-36795.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822212040-65805.jpg)
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