Question

1.若(z-x)2-4(x-y)(y-z)=0.求证:x,y,z成等差数列..

Answer 1

3.设公差为d. d=(ap-aq)/(p-q)=(m-n)/(p-q)

=(aq-ar)/(q-r) =(n-k)/(q-r)

=(ar-ap)/(r-p)=(k-m)/(r-p)

注;pqr均为下标

M(q-r)+N(r-p)+K(p-q)=m(n-k)/d+n(k-m)/d+k(m-n)/d=0

打字好累啊,一句话说不清啊!有事再问我吧!先做这道简单的吧!