$a=\sqrt{6};b=\sqrt{2};c=2\Rightarrow F_1(-2;0);F_2(2;0)$$\Rightarrow PT\Delta :x+y-2=0\Rightarrow toa do A,Bla nghiem cua he\begin{cases}x=2-y \\ \frac{x^{2}}{6}+\frac{y^{2}}{2}=0 \end{cases}$
He nay vo nghiem chung to de sai hoac la khong co diem A ,B thoa man de????