Ответ(ы) на вопрос:
Гость1. a)[latex] \left \{ {{2x-y=3} \atop {x+y=6}} \right. [/latex]
[latex] \left \{ {{2(6-y)-y=3} \atop {x=6-y}} \right. [/latex]
[latex] \left \{ {{12-2y-y=3} \atop {x=6-y}} \right. [/latex]
[latex] \left \{ {{3y=9} \atop {x=6-y}} \right. [/latex]
[latex] \left \{ {{y=3} \atop {x=3}} \right. [/latex]}}
6) x^2+2y^2 =5 2+y^2+2y^2=5 3y^2=3 y^2=1 y1=1 y2=-1
y^2-x^2=-2 x^2=2+y^2 x^2=2+1 x1=√3 x2 = -√3
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