摘要：
Problem DescriptionMath is important!! Many students failed in 2+2’s mathematical test, so let's AC this problem to mourn for our lost youth..Look this sample picture:A ellipses in the plane and center in point O. the L,R lines will be vertical through the X-axis. The problem is calculating the 阅读全文
posted @ 2011-11-12 14:30
lijihong0723
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