Question

Answer 1

Đặt x/2015=y/2016=z/2017=k

=>x=2015k; y=2016k; z=2017k

(x-z)^3=(2015k-2017k)^3=(-2k)^3=-8k^3

8(x-y)^2*(y-z)=8(2016k-2015k)^2*(2016k-2017k)=-8k^3

=>(x-z)^3=8(x-y)^2*(y-z)