Question

Giúp mình câu 7,9, mình cảm ơn.

Answer 1

7: \(\dfrac{a}{2\sqrt{a}-1}=\dfrac{a\left(2\sqrt{a}+1\right)}{4a-1}\)

9: \(\dfrac{1}{\sqrt{a}+\sqrt{a+1}}=\dfrac{\sqrt{a+1}-\sqrt{a}}{a+1-a}=\sqrt{a+1}-\sqrt{a}\)