Ответ:

1. B; 2. B

Пошаговое объяснение:

1. (a-b)(a+b)=a^2-b^2

(a-b)^2(a+b)^2=(a^2-b^2)^2(a^2-b^2)^2 => такая же тема и с дробными степенями:

(a-b)^(1/2)(a+b)^(1/2)=(a^2-b^2)^(1/2)(a^2-b^2)^(1/2)

(9-17^(1/2))^(1/6)(9+17^(1/2))^(1/6)=(81-17)^(1/6)=

=(64)^(1/6)=(2^6)^(1/6)=2^(6/6)=2

2. (n^2/(9m))^(1/3)/(3m^2/n/)^(1/3)=

=(n^2/(9m)*n/(3m^2/)^(1/3)=

=(n^3/(27m^3))^(1/3)=

=(n^3/((3m)^3))^(1/3)=

=(n/((3m))^(3/3)=

=n/(3m)

вроде так, 3 задание, хз