(sqrt(2)-1)*sqrt(4+sqrt(9-4*sqrt(2)))
1)9-4*sqrt(2)=1-2*2sqrt(2)+8=1^2-2*2sqrt(2)+(2sqrt(2))^2=(1-2sqrt(2))^2
sqrt(9-4sqrt(2))=|1-2*sqrt(2)|=2sqrt(2)-1
2) 4+sqrt(9-4sqrt(2))=4+2sqrt(2)-1=3+2sqrt(2)=2+2sqrt(2)+1=(1+sqrt(2))^2
sqrt(4+sqrt(9-4*sqrt(2)))=|1+sqrt(2)|=sqrt(2)+1
3)(sqrt(2)-1)(sqrt(2)+1)=2-1=1
Ответ:1