[질문] √0.2 X √4/5 X 5√5 답이랑식알려주세요

4/5 = 0.8 =4 X 0.2 이므로√4/5 = √4X0.2=2√0.2 따라서 √0.2 X √4/5 X 5√5 = √0.2 X 2√0.2 X 5√5 = 2 X (√0.2)의제곱 X 5√5 =2 X 0.2 X 5√5 = 2√5