x−2.√x=0
⇔√x2−2√x=0
⇔√x(√x−2)=0
⇔[√x=0√x−2=0⇔[x=0√x=2
⇔[x=0;x=4
Ta có: x−2\(\sqrt{x}\)=0
⇒\(\sqrt{x}\)( \(\sqrt{x}\) - 2 ) \(=\) 0
⇒\(\sqrt{x}\) \(=\) 0 hoặc \(\sqrt{x}\) - 2 \(=\) 0
⇒x \(=\) 0 hoặc \(\sqrt{x}\) \(=\) -2(Vô lí)
Vậy x \(=\) 0