b^(3n-1)/a^(2n-1)×c÷b^(3n-2)/a^2n
=b^(3n-1)/a^(2n-1)×c×a^2n/b^(3n-2)
=bb^(3n-2)/a^(2n-1)×c×aa^(2n-1)/b^(3n-2)
=abc不好意思，题打错了b^(3n-1)/a^(2n+1)×c÷b^(3n-2)/a^2nb^(3n-1)/a^(2n+1)×c÷b^(3n-2)/a^2n=b^(3n-1)/a^(2n+1)×a^2n/b^(3n-2)×c=bb^(3n-2)/aa^2n×a^2n/b^(3n-2)×c=bc/a