Răspunsuri

2014-10-07T18:25:31+03:00
a) 3√20 - 3√45 + 4√5=3·2·√5-3·3·√5=-3√5
b) (2-√3)²=4-4·√3+3=7-4·√3
c) (6-√2)² - (5+√2)²
=36-12√2-2-25-10√2-2=7-22√2