Question

Mọi người làm tiếp mình vớiti

Answer 1

Lam cau C dung ko ? cau D) chua bt lam :V \

a) DKXD : x \(\ne\pm2\)

C)

Ta cos :

A = \(\dfrac{\sqrt{x}+3}{\sqrt{x}-2}\)

ma : A < \(\dfrac{5}{3}< =>\dfrac{\sqrt{x}+3}{\sqrt{x}-2}< \dfrac{5}{3}< =>3\left(\sqrt{x}+3\right)< 5\left(\sqrt{x}-2\right)< =>\) \(3\sqrt{x}+9< 5\sqrt{x}-10< =>-2\sqrt{x}< -19< =>\sqrt{x}>\dfrac{19}{2}=>x=\dfrac{361}{4}\)

Vay...............