Question

Sendo x,y,z ,três termos consecutivos de uma P.A,demostre que 2y=x+z

Answer 1

$\mathsf{(a_{1}, a_{2}, a_{3}) =(x, y, z) }$

$\mathsf{a_{2}-a_{1}=a_{3}-a_{2}}$

$\mathsf{y-x=z-y} \\\mathsf{y+y=x+z}$

$\boxed{\boxed{\mathsf{2y=x+z}}}$