Question

Efectuati calculele:15 radical din 3-3(radical din 7+5 radical din 3)-2 radical din 7

Answer 1

15$\sqrt{3}$-3($\sqrt{7}$+5$\sqrt{3}$)-2$\sqrt{7}$=
=15$\sqrt{3}$-3$\sqrt{7}$+15$\sqrt{3}$-2$\sqrt{7}$=
=30$\sqrt{3}$-5$\sqrt{7}$=
=5(6$\sqrt{3}$-$\sqrt{7}$)