(√6+√8)×√3
=√18+√24
=3√2+2√6
(4√6-3√2)÷2√2
=4√6÷2√2-3√2÷2√2
=2√3-3/2
(√48-3√27)÷√3
=√(48/3)-3√(27/3)
=√16-3√9
=4-9
=-5
(3-√2)²
=9-6√2+2
=11-6√2
√3(√12-3√75)
=√36-3√225
=6-3×15
=-39
(20/3√3-3√6)×√18
=20/3√18-3√108
=(20/3)×3√2-3×6√3
=20√2-18√3
(√24-3√15+2√2/2/3)×√2
=(√24-3√15+3√2)×√2
=√48-3√30+3×2
=4√3-3√30+6