Question

giúp em với

Answer 1

Bài 40:

1: \(\dfrac{-2}{\sqrt{3}-1}=-\sqrt{3}-1\)

2: \(\dfrac{5}{1-\sqrt{6}}=-1-\sqrt{6}\)

3: \(\dfrac{2+\sqrt{5}}{2-\sqrt{5}}=-9-4\sqrt{5}\)

4: \(\dfrac{1}{5+2\sqrt{6}}=5-2\sqrt{6}\)