计算：(-6a^nb)^2·(3a^n-1b)=--------- -(-2ab^3)^2=-------------

(-6a^nb)^2*(3a^n-1b)
=36a^2nb^2*3a^(n-1)b
=108a^3n-1)b^3
-(-2ab^3)^2
=-4a^2b^6
[-(-1/2)^2]^2
=(-1/4)^2
=1/16