dat a=$\sqrt{y+1}$
$\Rightarrow\left\{ \begin{array}{l} x2a-2xa2=1\\ x3-3xa2=6 \end{array} \right. $
nhan cheo hai duoc :x2-6xa+9a2=0
$\Leftrightarrow x=3a\Rightarrow x=3\sqrt{y+1}$
the vao phuong trinh 1 duoc:tim duoc x va y
Chu y:toi khong biet go bac cua an !!!!!!!!!!!!!!!!