Question

a) ( 2√3 +√5) √3-√60

b)(5√2+2√5).√5 - √250

Dấu √ là kí hiệu căn bậc 2 ạ mọi ng giúp em vs

Answer 1

a) (\(2\sqrt{3}+\sqrt{5}\)).\(\sqrt{3}-\sqrt{60}\) = \(2\sqrt{3}^2+\sqrt{5}.\sqrt{3}-2\sqrt{15}\)

= \(6+\left(\sqrt{15}-2\sqrt{15}\right)\)= 6\(-\sqrt{15}\)

b) \(\left(5\sqrt{2}+2\sqrt{5}\right)\sqrt{5}-\sqrt{250}\) = \(2\sqrt{5}^2+\left(5\sqrt{2}.\sqrt{5}-\sqrt{250}\right)\)

= \(2.5+\left(\sqrt{250}-\sqrt{250}\right)\) = 10

Answer 2

"√"= can 2

ai chang biet

(≥6)

van de de bat lam gi?

=> do hoi