(12√27+5√3)(4√3-√2)=

[tex](12 \sqrt{27} + 5 \sqrt{3} )(4 \sqrt{3} - \sqrt{2} ) \\ 48\sqrt{81} - 12 \sqrt{54} + 20 \sqrt{9} - 5 \sqrt{6} \\ 48 (9) - 12 \sqrt{9 \times 6} + 20(3) - 5 \sqrt{6} \\ 432 - 12(3) \sqrt{6} + 60 - 5 \sqrt{6} \\ 432 - 36 \sqrt{6} + 60 - 5 \sqrt{6} \\ 432 + 60 - 36 \sqrt{6} - 5 \sqrt{6} \\ 492 - 41 \sqrt{6} [/tex]
Kalau tidak mengerti silakan tanya kembali, oke:)