по моему будет так (3-2^(1/3))(9+3*2^(1/3)+2^(2/3)=27+9*2^(1/3)+3*2^(2/3)-9*2^(1/3)-3*2^(1/3+1/3)-2^(1/3+2/3)=27-2^(3/3)=27-2^1=27-2=25