Question

Numarul ($(\sqrt{20} /3 -1/ \sqrt{5} )(10/ \sqrt{125} +12/ \sqrt{180} )$ este:
REZOLVARE COMPLETA! URGENT!

Answer 1

√20=2√5
(2√5/3-√5/5)(10√5/25+12√5/30)=
(2√5/3-√5/5)(2√5/5+2√5/5)=
(10√5-3√5)/15×4√5/5=
(7√5×4√5)/75=140/75=28/15