gmatprep两道数学题，请帮忙

abort

1,if xy =1, whta is the value of 2(x+y)^2/[2(x-y)^2]
A, 2     B, 4       C,8      D,16          E,32



2, A certain city with a popuation of 132000 is to be divided into 11 votiong districts, and no district is to have a population that is more than 10 percent greater than the populationo of any other distrit. What is the minimum posssible population that the least populated district could have?

A, 10700     B, 10800       C, 10900    D, 11000       E,11100
求解题思路！！

abort

一时着急，发错地方了，请版主删了吧