Question

[K.Hòa-T.Hương-V.Hùng]

Cho: P= ( 2/x-4 + 1/√x+2) : 1/√x+2

Tìm x để P=3/2

Answer 1

[Nguyễn Lê Phước Thịnh]

ĐKXĐ: \(\left\{{}\begin{matrix}x>=0\\x\ne4\end{matrix}\right.\)

\(P=\left(\dfrac{2}{x-4}+\dfrac{1}{\sqrt{x}+2}\right):\dfrac{1}{\sqrt{x}+2}\)

\(=\dfrac{2+\sqrt{x}-2}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}\cdot\dfrac{\sqrt{x}+2}{1}=\dfrac{\sqrt{x}}{\sqrt{x}-2}\)

Để P=3/2 thì \(\dfrac{\sqrt{x}}{\sqrt{x}-2}=\dfrac{3}{2}\)

=>\(3\left(\sqrt{x}-2\right)=2\sqrt{x}\)

=>\(3\sqrt{x}-2\sqrt{x}=6\)

=>\(\sqrt{x}=6\)

=>x=36(nhận)