Упростите выражение
[tex] \frac{ x^{2}+ y^{2} }{ x^{2}-xy + x^{2} } - \frac{ x^{2}- y^{2} }{x+y} =[/tex]
Варианты ответов:
1)-2y
2)2x
3)2y
4)2x-2y
5)-2x
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