\(\frac{a}{2}=\frac{b}{3}=\frac{c}{4}\Rightarrow\frac{a^2}{4}=\frac{b^2}{9}=\frac{c^2}{16}=\frac{2c^2}{32}=\)
\(=\frac{a^2-b^2+2c^2}{4-9+32}=\frac{108}{27}=4=2^2\)
\(\Rightarrow\frac{a^2}{4}=\left(\frac{a}{2}\right)^2=2^2\Rightarrow\frac{a}{2}=\pm2\Rightarrow a=\pm4\)
Tương tự với b và c