2limt 2
,, -(+) =1\2 ^2+^2=^2+^2+^2+2 -2(+)
; 06-23-2013 01:34 AM
(3 )solve in Rsystem
; 06-23-2013 09:26 PM
18 25 9 7
: 1 (0 1 )
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