Câu 1:\begin{matrix}x^2+y^2+\dfrac{1}{x^2}+\dfrac{1}{y^2}=5 \\(xy-1)^2=x^2-y^2+2 \end{matrix}
Câu 2:\begin{matrix}x^2+xy+y^2=3y-1 \\x^3+x^2y=x^2-x+1 \end{matrix}
Câu 3:\begin{matrix}x^2+3x^2y=\dfrac{8}{x} \\y^3-1=\dfrac{6}{x} \end{matrix}
Câu 4:\begin{matrix}x^2+y^2+xy+1=4y \\y(x+y)^2=2x^2+7y+2 \end{matrix}
Câu 5:\begin{matrix}x^2y^2+2y^2+16=11xy \\x^2+2y^2+12y=3xy^2 \end{matrix}
Câu 6:\begin{matrix}x\sqrt{y^2+6}+y\sqrt{x^2+3}=7xy \\x\sqrt{x^2+3}+y\sqrt{y^2+6}=x^2+y^2+2 \end{matrix}
Câu 7: \begin{matrix}2x+2x^2-2y^2=7 \\2(x^2+y^2)=5 \end{matrix}
Câu 8: \begin{matrix}x^4-2x=y^4-y \\(x^2-y^2)^3=3 \end{matrix}