(1)已知数列{an}满足a1=2,an+1=1+1/an(n∈N),写出该数列前三项
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[2]a1+a2=a1+a1q=a1(1+q)=3
a2+a3=a2+a2q=a2(1+q)=6
q=a2/a1=a2(1+q)/a1(1+q)=6/3=2
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