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[tex] \frac{x^{2}+ y^{2} }{ x^{2} +xy+ y^{2} } + \frac{x^{2}- y^{2} }{x^{2} -xy+ y^{2}} + \frac{2 y^{3}( x+y) }{ x^{4} + x^{2} y^{2} + y^{4} } [/tex] так чтобы в конце получился 2
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