Question

化简(3√5 - 2 √3)(2√5 + 3√3)

Answer 1

(3√5 - 2 √3)(2√5 + 3√3) =3√5×2√5+3√5×3√3-2√3×2√5-2√3×2√3 =30+9√15-4√15-12 =18+5√15