an*a(n-1)=a(n-1)+(-1)^nan=1+(-1)^n/a(n-1)a1=1a2=1+1/1=2a3=1-1/2=1/2a4=1+1/1/2=3a5=1-1/3=2/3a5/a3=(2/3)/(1/2)=4/3或者:an*a(n-1)=a(n-1)+(-1)^na(n+1)*an=an+(-1)^(n+1)相除,a(n+1)/a(n-1)=...
已知数列{an}满足anan-1=an-1+(-1)n次方(n≥2),且a1=1,则a5/a3=
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