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[tex] = (2 \sqrt{3} + 3 \sqrt{2} )(4 \sqrt{3} + 5 \sqrt{2} ) \\ = 8(3) + 10 \sqrt{6} + 12 \sqrt{6} + 15(2) \\ = 24 + 30 + 22 \sqrt{6} \\ = 54 + 22 \sqrt{6} [/tex]
Jawaban C