应该是a(n+1)=(1+an)/(1-an)吧,
代入数值,可递推得到:
a(4k+1)=a1=2,
a(4k+2)=a2=-3,
a(4k+3)=a3=-1/2,
a(4k+4)=a4=1/3,
——》a1*a2*...*a2013=[2*(-3)*(-1/2)*(1/3)]^503*a1=2.
应该是a(n+1)=(1+an)/(1-an)吧,
代入数值,可递推得到:
a(4k+1)=a1=2,
a(4k+2)=a2=-3,
a(4k+3)=a3=-1/2,
a(4k+4)=a4=1/3,
——》a1*a2*...*a2013=[2*(-3)*(-1/2)*(1/3)]^503*a1=2.