Xét: A = \frac{1}{2}\times \sqrt{\frac{1}{2}} - \frac{3}{2}\sqrt{4,5} + \frac{2}{5}\sqrt{50}<=> 2\sqrt{2}A = \sqrt{1} - 3\sqrt{9} + \frac{4}{5}\sqrt{100} = 1 - 9 + 8 = 0mà BT = A \div \frac{4}{5}\sqrt{\frac{1}{8}} = 0 Vậy BT = 0
Xét: A = $\frac{1}{2}$$\times&& \sqrt{\frac{1}{2}}$ -$ \frac{3}{2}$$\sqrt{4,5}$ + $\frac{2}{5}$$\sqrt{50}$<=> 2$\sqrt{2}$A = $\sqrt{1}$ - $3\sqrt{9}$ + $\frac{4}{5}$$\sqrt{100}$ = 1 - 9 + 8 = 0mà BT = A $\div$$ \frac{4}{5}$$\sqrt{\frac{1}{8}}$ = 0 Vậy BT = 0