数列{an} {bn}满足：a1=0 a2=1 a(n+2)=[an+a(n+1)]/2 bn=a(n+1)-an 求证

证明：a(n+2)=[an+a(n+1)]/2
a(n+2)-a(n+1)=-[a(n+1)-an]/2,即
b(n+1)=-bn/2,
b(n+1)/bn=-1/2,b1=a2-a1=1-0=1
所以bn是以q=-1/2等比数列
bn=b1q^(n-1)=(-1/2)^(n-1)