Calculati : a) 3√3*(√6-√15)-4√2+4√5=

Răspuns :

3√3*(√6-√15)-4√2+4√5=
=
3√(3*6)-3√(3*15)-4√2+4√5=
=9√2-9√5-4√2+4√5=
=5√2-5√5=
=5(√2-√5)