\(\frac{x}{4}=\frac{y}{3}\)=>\(\frac{x}{20}=\frac{y}{15}\)
3y = 5z =>\(\frac{y}{5}=\frac{z}{3}\)=>\(\frac{y}{15}=\frac{z}{9}\)
=> \(\frac{x}{20}=\frac{y}{15}=\frac{z}{9}\)
Ap dung t/c day ti so bang nhau, ta co :
\(\frac{x}{20}=\frac{y}{15}=\frac{z}{9}=\frac{x-y-z}{20-15-9}=\frac{100}{-4}=-25\)
\(\frac{x}{20}=-25\)=> x = -500
\(\frac{y}{15}=-25\)=> y = -375
\(\frac{z}{9}=-25\)=> z = -225
Vay x = -500; y = -375; z = -225
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