ТЕСТОВЫЙ ВОПРОС (МАТЕМАТИКА 9 КЛАСС) Пусть (x;y) - решение системы: [tex]\left \{ {{\sqrt{\frac{y}{x} }-2*\sqrt{\frac{x}{y} } =1} \atop {\sqrt{5*x+y}+\sqrt{5*x-y}=4 }} \right.[/tex] Найти 5x+y
A)-8
B)10
C)-7
D)9
E)14
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