Решите системы:
1) [tex]\left \{ {x^{2} +{y^{2} =8} \atop {\frac{1}{x}+\frac{1}{y} =\frac{1}{2} }} \right.[/tex]
2)[tex]\left \{ {{x-y=2} \atop {xy=4}} \right.[/tex]
3)[tex]\left \{ {{x^{2}+y^{2} =25} \atop {x+y=5}} \right.[/tex]
1) [tex]\left \{ {x^{2} +{y^{2} =8} \atop {\frac{1}{x}+\frac{1}{y} =\frac{1}{2} }} \right.[/tex]
2)[tex]\left \{ {{x-y=2} \atop {xy=4}} \right.[/tex]
3)[tex]\left \{ {{x^{2}+y^{2} =25} \atop {x+y=5}} \right.[/tex]
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