Question

\(\dfrac{3x}{2}=\dfrac{2y}{5}\) và x-y=18

Tìm x,y biết.

Answer 1

Áp dụng TCDTSBN ta có:

\(\dfrac{3x}{2}=\dfrac{2y}{5}=\dfrac{6x-6y}{4-15}=-\dfrac{108}{11}\)

\(\dfrac{3x}{2}=-\dfrac{108}{11}\Rightarrow x=-\dfrac{72}{11}\\ \dfrac{2y}{5}=-\dfrac{108}{11}\Rightarrow y=-\dfrac{270}{11}\)