Question

помогите 556 под А
:))))

Answer 1

$sqrt{sqrt{23}-sqrt{19}}cdot sqrt{sqrt{23}+sqrt{19}}+sqrt{5sqrt2+7}cdot sqrt{5sqrt2-7}=\\sqrt{(sqrt{23}-sqrt{19})(sqrt{23}+sqrt{19})}+sqrt{(5sqrt2+7)(5sqrt2-7)}=\\=sqrt{23-19}+sqrt{25cdot 2-49}=sqrt4+sqrt1=2+1=3$

Answer 2

=$= sqrt{ sqrt{2 }^2-2*1* sqrt{2}+1^2} *sqrt{sqrt{2 }^2+2*1* sqrt{2}+1^2} - \ -sqrt{ sqrt{6} ^2-2*1* sqrt{6}+1^2}* sqrt{ sqrt{6} ^2-2*1* sqrt{6}+1^2}= \ = sqrt{( sqrt{2}-1 )^2}* sqrt{( sqrt{2}+1 )^2}- sqrt{( sqrt{7}-1 )^2}* sqrt{( sqrt{7}+1 )^2}= \ =| sqrt{2}-1|*| sqrt{2}+1|- |sqrt{7}-1|* |sqrt{7}+1|= \ = ( sqrt{2}-1)*( sqrt{2}+1)- (sqrt{7}-1)* (sqrt{7}+1)= \ = sqrt{2}^2-1- sqrt{7}^2+1=2-7=-5$