: y=x^2+2x ( ) x,y
!
(09-16-2013), (08-05-2013)
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... -... ( )
(09-16-2013), (08-01-2013), (10-15-2013), (08-01-2013), (08-01-2013), (08-01-2013)
: 1 (0 1 )
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