\(\frac{a}{2}=\frac{b}{3}=\frac{c}{4}=\frac{a^2}{4}=\frac{b^2}{9}=\frac{2c^2}{32}\)
áp dụng tcdtsbn ta có:
\(\frac{a^2}{4}=\frac{b^2}{9}=\frac{2c^2}{32}=\frac{a^2-b^2+2c^2}{4-9+32}=\frac{108}{27}=4\)
từ a^2/4=4=>a^2=16=>a=+4
b^2/9=4=>b^2=36=>b=+6
2c^2/32=4=>2c^2=128=>c^2=64=>c=+8
vậy a=4 hoặc a=-4
tick nhé bạn