[Toán 9]

1

11thanhkhoeo

Ghết x yêu y

=> [TEX] \left\{\begin{matrix} x+y=80 &\\ \frac{x}{3}+ \frac{y}{10}=15 \end{matrix}\right.[/tex]

[tex] \left\{\begin{matrix} x=30 &\\ y=50 \end{matrix}\right.[/TEX]
 
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