Question

помогите срочно нужно

Answer 1

$sqrt{11-4sqrt7}-sqrt{(1-sqrt7)^2}=\ sqrt{4-4sqrt7+7}-|1-sqrt7|=\ sqrt{(2-sqrt7)^2}-(-1+sqrt7)=\ |2-sqrt7|+1-sqrt7=\ -2+sqrt7+1-sqrt7=\ -1$