數學知識交流(7)

I think the question is x/(a-b) = y/(b-c) = z/(c-a)

Let w = x/(a-b) = y/(b-c) = z/(c-a)

then x = w(a-b) , y = w(b-c) , z = w(c-a)

x + y + z = ? = w(a-b) + w(b-c) + w(c-a) = 0

個答案係唔係
a+b+c