1题:已知{an}中,a1=根号2,a(n+1)=根号2倍的an,求an2题:已知{an}中,a1=1,a(n+1)=an+(1/2)n,求an3题:已知{an}中,a1=—2,an=a(n—1)+3,求an4题:f(1)=1/2,f(n+1)=((2^n)+f(n))/2,求f(n)

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