Question

0,25V112 - 1/3 V252 -2 V448

Answer 1

$\displaystyle\bf\\0,25\sqrt{112} -\frac{1}{3} \sqrt{252} -2\sqrt{448} =\\\\=25\sqrt{16\cdot7} -\frac{1}{3} \sqrt{36\cdot 7} -2\sqrt{64\cdot 7}=\\\\\\=25\cdot 4\sqrt{7} -\frac{1}{3} \cdot 6\sqrt{7} -2\cdot 8\sqrt{7} =\\\\\\= 100\sqrt{7} -2\sqrt{7} -16\sqrt{7} =82\sqrt{7$