$\left\{\begin{matrix} \sqrt{3+2x^{2}y-x^{4}y^{2}}+x^{4}(1-2x^{2})=y^{2} & & \\ 1+\sqrt{1+(x-y)^{2}}=x^{3}(x^{3}-x+2y^{2}) & & \end{matrix}\right.$$\left\{\begin{matrix} x^2 + \frac{1}{x^2} + y^2 +\frac{1}{y^2} = 5 & & \\ (x^2-1)(y^2+1)[xy(x+y)+(x-y)] = (x^2+y^2)(x^2y^2+1) = 11 & & \end{matrix}\right.$Tìm...