Question

√7*√63-√27/√12
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Answer 1

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