[讨论]Princeton Test1- Math 27 DS

higoingusa86

Dear xdjm, has anyone met this question before? So confusing...

If x=3y, is x2>y2?

(1) y+x< y-x
(2) x^2=y^2

Ans: A

What is the question, first of all? x^2 compared to y^2? why B is not corret?



Thanks!!

[此贴子已经被作者于2008-9-7 3:26:31编辑过]