Помогите решить систему уравнений 1)[tex] \left \{ {{2*3^x-4^y=14} \atop {3^x+4^y=13}} ight. [/tex]
2)[tex] \left \{ {{log3x+log3y=1} \atop {y-3x=8}} ight. [/tex]
3)[tex] \left \{ {{2+log2(x+y)=log2 8 } \atop {x^2-y^2=16}} ight. [/tex]