请教几道数学题

wqing316

还有几天就要考试了，作prep时遇到了些问题，请教大家：

T1：which of the following lists the number of points at which a circle can intersect a triangle?

    a:2 and 6 only ;  b: 2,4,6;c: 1,2,3,6; d:1,2,3,4,6,  e: 1,2,3,4,5,6 完全读不懂是什么意思？不胜感激！

 T2：bobby  bought two shares of stock ,which he sold for $96 each , if he had a profit of 20% on the sale of one of the shares but a loss of 20% on the sale of the other share ,then  on the sale of both shares combined had : a loss of $8.  这个答案怎么的出来的，我怎么算出来是既没有损失也没有盈利呢？

T3.根据：x+y+0.01xy=9.2,怎么算出1000（x+1）*（y+1）=?

thank you!

fly_holly

以下是引用wqing316在2007-8-7 21:13:00的发言：

还有几天就要考试了，作prep时遇到了些问题，请教大家：

T1：which of the following lists the number of points at which a circle can intersect a triangle?

    a:2 and 6 only ;  b: 2,4,6;c: 1,2,3,6; d:1,2,3,4,6,  e: 1,2,3,4,5,6 完全读不懂是什么意思？不胜感激！

 T2：bobby  bought two shares of stock ,which he sold for $96 each , if he had a profit of 20% on the sale of one of the shares but a loss of 20% on the sale of the other share ,then  on the sale of both shares combined had : a loss of $8.  这个答案怎么的出来的，我怎么算出来是既没有损失也没有盈利呢？

T3.根据：x+y+0.01xy=9.2,怎么算出1000（x+1）*（y+1）=?

thank you!

1下面那个是列出了一个圆和一个三角形可能相交几个点  E 这题画图就能知道

最好有疑问发到数学版本

modelwinter

T2: x(1+20%)=96------x=80

    y(1-20%)=96------y=120

   96*2-80-120=-8

T3: x+y+0.01xy=9.2

    100(x+y)+xy=920=900+20

   so  x+y=9

       xy=20

    so  x=4 y=5

so  1000(x+1)(y+1)=30000

maybe this method is little accidental. but it can manage somehow.