已知数列an满足a1=1/2,2an+1-an=1.1.求an的通项公式 2.证明:求和Sn=a已知数列an满足a1=1/2,2an+1-an=1.1.求an的通项公式2.证明:求和Sn=a1+a2+···+an

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