√70以上 (x y z)^3 expansion 303177-(x+y+z)^3 expansion

We know the corollary if a b c = 0 then a 3 b 3 c 3 = 3 a b c Using the above identity taking a = x − y , b = y − z and c = z − x , we have a b c = x − y y − z z − x = 0 then the