Question

[Boy with luv 2019]

Giải hpt:

x² - 3xy + 2y²= 0

3x + y = 6

Answer 1

[Nguyễn Việt Lâm]

\(x^2-3xy+2y^2=0\Leftrightarrow\left(x-y\right)\left(x-2y\right)=0\Rightarrow\left[{}\begin{matrix}x=y\\x=2y\end{matrix}\right.\)

Thay xuống dưới:

- Với \(x=y\Rightarrow3y+y=6\Rightarrow y=\frac{3}{2}\Rightarrow x=\frac{3}{2}\)

- Với \(x=2y\Rightarrow6y+y=6\Rightarrow y=\frac{6}{7}\Rightarrow x=\frac{12}{7}\)

Answer 2

[Boy with luv 2019]

Thank you