Đặt: \(\dfrac{a}{2012}=\dfrac{b}{2013}=\dfrac{c}{2014}=k\)
\(\rightarrow a=2012k,b=2013k,c=2014k\)
Vế trái: \(4.\left(2012k-2013k\right)\left(2013k-2014k\right)=4.\left(-1k\right).\left(-1k\right)=4k^2\)
Vế phải: \(\left(2014k-2012k\right)^2=\left(2k\right)^2=4k^2\)
\(\rightarrow\) Vế trái = vế phải = \(4k^2\)