(1)(a^2 -b^ 2)除以(a-b/a)^ 2
=(a+b)(a-b)÷(a-b)²/a²
=a²(a+b)/(a-b)
(2){(-b^ 2n+1/2a)^ 3}^ 2
=(-b^ 2n+1/2a)^ 6
=b^12n+6/64a^6