Question

-Efectuati :
A) (2√3-3√2)•(3√3+2√2).
B) (2√7-1)•(3√5-√7+2).
-Vreau rezolvarea completa !

Answer 1

a) 2√3·3√3+2√3·2√3-3√2·3√3-3√3·2√2
=6√9+4√9-9√6-6√4
=6·3+4·3-9√6 -6·2
=18+12-12-9√6
=18-9√6
=3√2-9√6
b) 2√7·3√5+2√7·√7+2√7·2-3√5 +√7-2
=6√35+2·7+4√7-3√5+√7-2
=6√35+14+5√7-3√5-2
=6√35+12+5√7-3√5 :*