Question

Giúp mình vs ạ

Answer 1

a) `(\sqrt28y^6)/(\sqrt7y^4)=\sqrt((28y^6)/(7y^4))=\sqrt(4y^2)=-2y`
b) `\sqrt((14a)/b). \sqrt((7ab^3)/2)=\sqrt( (14a)/b . (7ab^3)/2)=\sqrt(49a^2b^2)=7ab`
c) `\sqrt(\sqrt(x^2+4)-x^2) . \sqrt(\sqrt(x^2+4)+x^2) = \sqrt( (\sqrt(x^4+4) -x)(\sqrt(x^4+4)+x^2)`
`= \sqrt(x^4+4-x^4) = \sqrt4=2`

Answer 2

mình mới làm cho bạn xong luôn

https://hoc24.vn/cau-hoi/giup-minh-bai-6b-voi-ak.1283175216977