3倍根号下3加2倍根号下2乘以2倍根号下3减3倍根号下2等于拜托了各位

(3√3+2√2)(2√3-3√2) =3√3×2√3-3√3×3√2+2√2×2√3-2√2×3√2 =18-9√6+4√6-12 =6-5√6