Срочно помогите ответить на уравнения!!!! 20баллов..
[tex]\left \{ {x-y=2} \atop {x^{2}-y^{2}=8 }} \right.[/tex]
[tex]\left \{ {{x-y=0,6} \atop {y^{2}-x^{2}=12 }} \right.[/tex]
[tex]\left \{ {{x+y=3} \atop {x^{2}-y^{2}-4xy+11=0 }} \right.[/tex]

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