\(\sqrt{1} = 1\)

\(\sqrt{9} = 3\)

\(\sqrt{64} = 8\)

\(\sqrt{9} + \sqrt{36} = 3 + 6 = 9\)

\(6 \sqrt{144} - 9 \sqrt{64} = 6 ⋅ 12 - 9 ⋅ 8 = 0\)

\(\sqrt{36} ⋅ \sqrt{25} = 6 ⋅ 5 = 30\)

\((-8 \sqrt{5})^{2} = (-8)^{2} ⋅ \sqrt{5}^{2} = 64 ⋅ 5 = 320 \text{.}\)

\((5 \sqrt{6} - 3) (5 \sqrt{6} + 3) = (5 \sqrt{6})^{2} - 3^{2} = 25 ⋅ 6 - 9 = 150 - 9 = 141 \text{.}\)

\((\sqrt{11})^{2} = 11 \text{.}\)

\(6 (\sqrt{5})^{2} = 6 ⋅ 5 = 30 \text{.}\)

\(9 \sqrt{14} + 4 \sqrt{14} = 13 \sqrt{14}\)

\(4 \sqrt{5} ⋅ 6 \sqrt{3} = 24 \sqrt{15}\)

\({\sqrt{70} \over \sqrt{7}} = \sqrt{10}\)

\({4 \sqrt{80} \over \sqrt{8}} = 4 ⋅ {\sqrt{80} \over \sqrt{8}} = 4 \sqrt{10}\)

\({30 \sqrt{28} \over 5 \sqrt{7}} = {30 \over 5} ⋅ {\sqrt{28} \over \sqrt{7}} = 6 ⋅ \sqrt{4} = 6 ⋅ 2 = 12\)