若数列{an}中,a1=3,a2=6,a(n+2)=a(n+1)-an求第五项

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若数列{an}中,a1=3,a2=6,a(n+2)=a(n+1)-an求第五项若数列{an}中,a1=3,a2=6,a(n+2)=a(n+1)-an求第五项若数列{an}中,a1=3,a2=6,a(n

若数列{an}中,a1=3,a2=6,a(n+2)=a(n+1)-an求第五项
若数列{an}中,a1=3,a2=6,a(n+2)=a(n+1)-an求第五项

若数列{an}中,a1=3,a2=6,a(n+2)=a(n+1)-an求第五项
a3=a2-a1=6-3=3
a4=a3-a2=3-6=-3
a5=a4-a3=-3-3=-6