[Toán 9] Hệ phương trình

L

lp_qt

\Rightarrow $\left\{\begin{matrix}t+y=2 & \\ \dfrac{1}{t^2}+\dfrac{2}{y}=3 & \end{matrix}\right. t=\dfrac{1}{x}$

\Leftrightarrow $\left\{\begin{matrix}y=2-t & \\ y+2t^2=3t^2y & \end{matrix}\right.$

\Rightarrow $2-t+2t^2=3t^2(2-t)$

\Leftrightarrow $3t^3-4t^2-t+2=0$

\Leftrightarrow $\begin{bmatrix}t=\dfrac{-2}{3} & \\ t=1 & \end{bmatrix}$

\Leftrightarrow .............
 
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