Question

根号2/根号8-根号3（1-根号15）-3根号1/5 我要

Answer 1

根号2/根号8-根号3（1-根号15）-3根号1/5

=1/√4-√3+√3×√15-3√5/5

=1/2-√3+3√5-3√5/5

=1/2-√3+12√5/5;