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2).
= + - /
=
=
=
=
2) (2√3 - √8) (3√3 + 3√2)
= 18 + 6√6 - 3√24 - 3√16
= 18 + 6√6 - 3√4×6 - 3×4
= 18 + 6√6 - 3×2√6 -12
= 18 + 6√6 - 6√6 - 12
= 18 - 12
= 6