Question

(-2√2)×√10 giúp vs ạ

Answer 1

=-2căn 20=-4căn 5

Answer 2

\(-2\sqrt{2}\cdot\sqrt{10}=-2\sqrt{2\cdot10}=-2\sqrt{20}=-2\sqrt{4\cdot5}=-2\cdot2\sqrt{5}=-4\sqrt{5}\)