Question

[Nguyễn Minh An]

Làm giúp mik câu c,d nha , cảm ưn nhiều

Answer 1

[Kirito-Kun]

\(\left\{{}\begin{matrix}\dfrac{x}{2}=\dfrac{y}{3}\\xy=6\end{matrix}\right.\) <=> \(\left\{{}\begin{matrix}3x=2y\\xy-6=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}3x-2y=0\\xy-6=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}3xy-2y^2=0\\3xy-18=0\end{matrix}\right.\)

<=> \(\left\{{}\begin{matrix}-2y^2-\left(-18\right)=0\\3xy-2y^2=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=3\\9x-18=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=3\\x=2\end{matrix}\right.\)

Answer 2

[Kirito-Kun]

câu b tương tự