GMATPREP数学
If xy=1, what is the value of 2(x+y)^2/2(x-y)^2?
A 2
B 4
C 8
D 16
E 32
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http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=150752
choices: 2,4,8,16,32
Key:16
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