$3\sqrt{5} - 4\sqrt{3} + 2\sqrt{5} + 2\sqrt{3} = $

$5\sqrt{3} + 2\sqrt{3} - 4\sqrt{7} = $

$\sqrt{12} + 8\sqrt{3} = $

$\sqrt{20} + 3\sqrt{10} = $

$\sqrt{54} - 2\sqrt{6} = $

$\sqrt{12} - 7\sqrt{3} = $

$\sqrt{400} - 3\sqrt{2} = $

$3\sqrt{7} \times 2\sqrt{7} = $