Question

rút gọn

\(\dfrac{2}{2a-1}\sqrt{5a^2\left(1-4a+4a^2\right)}\) với a > 0,5

Answer 1

\(=\dfrac{2\sqrt{5}\left|a\left(2a-1\right)\right|}{2a-1}=\dfrac{2a\left(2a-1\right)\sqrt{5}}{2a-1}=2a\sqrt{5}\)

Answer 2

\(=\dfrac{2\sqrt{5}\cdot a\left(2a-1\right)}{2a-1}=2a\sqrt{5}\)