1.x,y,z是三角形的三个边,且x>y>z,三角形面积为1,问y的范围?(y>2^0.5)
不会做啊
2, If for integers C,6<C<20,what is the least possible value of the equation (20-C)/(6-C)?(-13)
不知道为什么会有the least possible 的问题?(20-C)/(6-C)不是单调递增的函数么?
3.Every internal angle in a polygen is less than 180. How much is the average internal angle for a polygenB)
(1)there are two right internal angles (2)there are five vertices
不是很理解题目
4,一个包中装有7个红色的物体,5个绿色的物体,问从中随意取出3个是全红的概率(7/24)
我觉得是7/24 C7,3/C10,3 (7,10均是下标;俩个3都是上标)
[此贴子已经被作者于2005-2-22 14:45:54编辑过] |