Question

20 points //// Please solve it quickly

Answer 1

$\frac{2}{ \sqrt{1 - \frac{4}{9} } } \\ \\ = \frac{2}{ \sqrt{ \frac{5}{9} } } \\ \\ = \frac{2}{ (\frac{ \sqrt{5} }{3} )} \\ \\ = \frac{2 \times 3}{ \sqrt{5} } \\ \\ = \frac{6}{ \sqrt{5} } \\ \\ = \frac{6}{ \sqrt{5} } \times \frac{ \sqrt{5} }{ \sqrt{5} } \\ \\ = \frac{6 \sqrt{5} }{5}$

Answer 2

2/√1-4/9 .......so now first do 1-4/9=5/9. so √5/9=√5/3. so now 2×3/√5 =6/√5 ×√5/√5=6√5/5