Question

Giúp em bài này vs

Answer 1

\(P=\dfrac{2\left(\sqrt{x}+2\right)+7}{\sqrt{x}+2}=2+\dfrac{7}{\sqrt{x}+2}\)

P nguyên \(\Rightarrow7⋮\left(\sqrt{x}+2\right)\Rightarrow\sqrt{x}+2=Ư\left(7\right)\)

Mà \(\sqrt{x}+2\ge2\Rightarrow\sqrt{x}+2=7\)

\(\Rightarrow\sqrt{x}=5\Rightarrow x=25\)