(x-y)(х+y)/(х-y)- (x-y)(х^2+xy+y^2)/( x-y)(х+y) = (х+y)- (х^2+xy+y^2)/(х+y) =(2х^2+3xy+2y^2)/x+y
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(x-y)(х+y)/(х-y)- (x-y)(х^2+xy+y^2)/( x-y)(х+y) = (х+y)- (х^2+xy+y^2)/(х+y) =(2х^2+3xy+2y^2)/x+y