Câu 1:$\left\{\begin{matrix} x^3+2xy^2+12y=0 \\ 8y^2+x^2=12 \end{matrix}\right.$
Câu 2: $\left\{\begin{matrix}2x^3+x^2+y^2=y(x+1)^2 \\ x(y+1)=2 \end{matrix}\right.$
Câu 3:$\left\{\begin{matrix}\sqrt[3]{10x-y}+\sqrt{3x-y}=3\\ 2x+y+\sqrt{3x-y}=5 \end{matrix}\right.$
Câu 4: $\left\{\begin{matrix} 3y^2+1+2y(x+1)=4y\sqrt{x^2+2y+1}\\ y(y-x)=3-3y \end{matrix}\right.$
Câu 5: $\left\{\begin{matrix} x^2+y^2+\frac{2xy}{x+y}=1\\ \sqrt{x+y}=x^2-y \end{matrix}\right.$[/SIZE][/FONT][/QUOTE]