http://im9.gulfup.com/2011-08-31/1314826228671.swf
Q1-10.Solve the equation 3/3/2013 23 Q1. - q20-q21
http://im2.gulfup.com/2011-03-17/1300332689751.jpg (1) ... prove that
(1) 2012
: 1 (0 1 )
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