Question

√7*√63-√27/√12
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Answer 1

$\sqrt{7} *\sqrt{63} -\frac{\sqrt{27} }{\sqrt{12}} =\\=\sqrt{7*63}-\frac{\sqrt{9*3}}{\sqrt{4*3}}=\\=\sqrt{441} - \frac{3*\sqrt{3}} {2*\sqrt{3}} =\\=21 - \frac{3}{2} =\\=21-1.5=\\=19.5$