(a^2+1分之b^3n-1*c^2)*b^3n-2分之a^2n-1
问题描述：
(a^2+1分之b^3n-1*c^2)*b^3n-2分之a^2n-1
答
=a^(2n-1-2n-1)b^(3n-1-3n+2)c^2
=bc^2/a^2