(1).(1/2a^2b)^2(2).(-b)^2·(-b^2)(3).(a^2·a^n)^m·(a^3·a^m)^n(4).(-xy^n)^2+(2xy^2)^n

(1).(1/2a^2b)^2(2).(-b)^2·(-b^2)(3).(a^2·a^n)^m·(a^3·a^m)^n(4).(-xy^n)^2+(2xy^2)^n
(1).(1/2a^2b)^2
(2).(-b)^2·(-b^2)
(3).(a^2·a^n)^m·(a^3·a^m)^n
(4).(-xy^n)^2+(2xy^2)^n

(1).(1/2a^2b)^2(2).(-b)^2·(-b^2)(3).(a^2·a^n)^m·(a^3·a^m)^n(4).(-xy^n)^2+(2xy^2)^n
(1).(1/2a^2b)^2
=1/4a^4b
(2).(-b)^2·(-b^2)
=b^2*(-b^2)
=-b^4
(3).(a^2·a^n)^m·(a^3·a^m)^n
=a^2n+m*a^3m+n
=a^3n+4m
(4).(-xy^n)^2+(2xy^2)^n
=x^2y^2n+2^nx^ny^2n

^是乘号还是平方啊???