计算：[-1/4a^(3-n)b^(m-1)]^2·（4a^(3+n)b)^2

计算：[-1/4a^(3-n)b^(m-1)]^2·（4a^(3+n)b)^2
=[-1/4a^(3-n)b^(m-1) * 4a^(3+n)b ]^2
=[a^(3-n+3+n)b^(m-1+1) ]^2
=(a^6*b^m)²
=a^12 * b^(2m)