Пусть x+y=-3, а xy=-5.Найдите значение выражения:
а)[tex] x^{3} + y^{3} [/tex]
б)[tex] x^{2} y^{7} + x^{7} y^{2} [/tex]
а)[tex] x^{3} + y^{3} [/tex]
б)[tex] x^{2} y^{7} + x^{7} y^{2} [/tex]
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