Giải phương trình

L

lp_qt

1.
$y=\sqrt{17-x^2} (y\ge 0)$

$\left\{\begin{matrix}x+y+xy=9 & \\ x^2+y^2=17 & \end{matrix}\right.$

\Leftrightarrow $\left\{\begin{matrix}(x+y)+xy=9 & \\ (x+y)^2-2xy=17& \end{matrix}\right.$

\Leftrightarrow $\left\{\begin{matrix}xy=... & \\ x+y=... & \end{matrix}\right.$

\Leftrightarrow $\left\{\begin{matrix}x=... & \\ y=... & \end{matrix}\right.$
 
You must log in or register to reply here.
Top Bottom