Tolong dijawab yaa makasih:)

1.) 2^4 x^9 y^15/2^3 x^6 y^12
     =2^(4-3) x^(9-6) y^(15-12)
     =2 x³ y³
2.) 5√6+√9·6-√4·6=5√6+3√6-2√6
                             =6√6
3.) 3/√5-√3=3(√5+√3)/√5-√3(√5+√3)
                 =3√5+3√3/5-3
                 =3√5+3√3/2