Question

Bài 1 : So sánh \(\dfrac{-\sqrt{10}}{2}và-2\sqrt{5}\)

Answer 1

\(-2\sqrt{5}=\dfrac{-4\sqrt{5}}{2}\)

\(-\sqrt{10}>-\sqrt{80}=-4\sqrt{5}\)

nên \(-\dfrac{\sqrt{10}}{2}>-\dfrac{4\sqrt{5}}{2}=-2\sqrt{5}\)