a)(√2+√3)(√8-√12)=
(√2+√3)(2√2-2√3)=
2(√2+√3)(√2-√3)=
2(2-3)=(-2)
b)5√24-3√54+2√3/√2=
10√6-9√6+√6=2√6
c)2√27-3√48+6√72/√24=
6√3-12√3+36√2/2√6=
-6√3+18√2/√6=
-6√3+36√3/6=
-6√3+6√3=0
d)Cum n-am primit nici un raspuns, am dedus ca la numitor este doar 3√a
a-3√a/3√a -9=
a-1-9=
a-10