52=5 × 22×2=522\;\frac{5}{\sqrt{2}} = \frac{5\;\times\;\sqrt{2}}{\sqrt{2} \times \sqrt{2}} = \frac{5\sqrt{2}}{2}25=2×25×2=252
88=228=24\;\frac{\sqrt{8}}{8} = \frac{2\sqrt{2}}{8} = \frac{\sqrt{2}}{4}88=822=42
52−88=(52−14)2\;\frac{5}{\sqrt{2}} - \frac{\sqrt{8}}{8} = \left(\frac{5}{2} - \frac{1}{4}\right)\sqrt{2}25−88=(25−41)2
= 942\;\frac{9}{4}\sqrt{2}492
= 2 1422\;\frac{1}{4}\sqrt{2}2412
