Question

 2x = 3y = 5z và x + y –z = 95

Answer 1

\(2x=3y=5z\Rightarrow\dfrac{x}{\dfrac{1}{2}}=\dfrac{y}{\dfrac{1}{3}}=\dfrac{z}{\dfrac{1}{5}}\)

Áp dụng TCDTSBN ta có:

\(\dfrac{x}{\dfrac{1}{2}}=\dfrac{y}{\dfrac{1}{3}}=\dfrac{z}{\dfrac{1}{5}}=\dfrac{x+y-z}{\dfrac{1}{2}+\dfrac{1}{3}-\dfrac{1}{5}}=\dfrac{95}{\dfrac{19}{30}}=150\)

\(\dfrac{x}{\dfrac{1}{2}}=30\Rightarrow x=15\\ \dfrac{y}{\dfrac{1}{3}}=30\Rightarrow y=10\\ \dfrac{z}{\dfrac{1}{5}}=150\Rightarrow z=30\)