Question

помогите !!!!!!!!! корень из (9-4корень из 2) умножить на (1+2корень из2)=

Answer 1

$\sqrt{9-4\sqrt{2}}*(1+2\sqrt{2})=\sqrt{(8-4\sqrt{2}+1)}*(2\sqrt{2}+1)=\sqrt{(2\sqrt{2}-1)^2}*(2\sqrt{2}+1)=(2\sqrt{2}-1)*(2\sqrt{2}+1)=(2\sqrt{2})^2-1=8-1=7$