(x- x^2-y^2 дробь x-y) (y+ x^2-y^2 дробь x+y) упростите выражение x- и y+ не входят в дробь
(x-(x^2-y^2)/(x-y))•(y+(x^2-y^2)/(x+y))= =(x-(x-y)(x+y)/(x-y))•(y+(x-y)(x+y)/(x+y))= =(x-(x-y))•(y+(x-y))=y•x