往回推导,a4=3*a3+1=2,
so,a3=1/3=a2/2
then,a2=2/3=3*a1+1
so,a1=-1/9
已知数列{an}满足;a1=m(m为正整数）a（n+1)=an/2（an为偶数）,a（n+1)=3an+1（an为奇数）
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