\(\sqrt{12}+\sqrt{27}-\sqrt{3}\)
=\(\sqrt{4.3}+\sqrt{9.3}-\sqrt{3}\)
=\(\Leftrightarrow\)\(2\sqrt{3}+3\sqrt{3}-\sqrt{3}\)
=\(4\sqrt{3}\)
=\(\sqrt{3}\left(\sqrt{4}+\sqrt{9}-1\right)\)
=\(\sqrt{3}\left(2+3-1\right)\)
=\(4\sqrt{3}\)