已知数列{an}满足a1=a,an=1/[a(n-1)]+1(n>=2),若a4=0,则a等于?
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已知数列{an}满足a1=a,an=1/[a(n-1)]+1(n>=2),若a4=0,则a等于?已知数列{an}满足a1=a,an=1/[a(n-1)]+1(n>=2),若a4=0,则a等
已知数列{an}满足a1=a,an=1/[a(n-1)]+1(n>=2),若a4=0,则a等于?
已知数列{an}满足a1=a,an=1/[a(n-1)]+1(n>=2),若a4=0,则a等于?
已知数列{an}满足a1=a,an=1/[a(n-1)]+1(n>=2),若a4=0,则a等于?
由已知有a2=1/a1+1=1/a+1=(a+1)/a,a3=1/a2+1=a/(a+1)+1=(2a+1)/(a+1)
a4=1/a3+1=(a+1)/(2a+1)+1=(3a+2)/(2a+1)=0,解得a=-2/3
a1=a
a2=1/a1 +1=1/a +1
a3=1/a2 +1=(1+2a)/(1+a)
a4=1/a3 +1=(2+3a)/(1+2a)
a4=0
所以(2+3a)=0 或者 1+2a=0
a=-1/2或-2/3
应该是这样吧
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