\[ \sqrt{12} = \sqrt{4 \times 3} = \sqrt{4} \times \sqrt{3} = 2\sqrt{3} \] \[ \sqrt{27} = \sqrt{9 \times 3} = \sqrt{9} \times \sqrt{3} = 3\sqrt{3} \]
\[ \sqrt{12} + \sqrt{27} = 2\sqrt{3} + 3\sqrt{3} \]
\[ 2\sqrt{3} + 3\sqrt{3} = (2 + 3)\sqrt{3} = 5\sqrt{3} \]
\(\boxed{5\sqrt{3}}\)
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