Question

Answer 1

Câu 5:

a: ĐKXĐ: \(\left\{{}\begin{matrix}x\ge0\\x\ne1\end{matrix}\right.\)

b: Ta có: \(A=x-\dfrac{2x-2\sqrt{x}}{\sqrt{x}-1}+\dfrac{x\sqrt{x}+1}{x-\sqrt{x}+1}+1\)

\(=x-2\sqrt{x}+x+1+1\)

\(=2x-2\sqrt{x}+2\)

Answer 2

Câu 3:

a: ĐKXĐ: \(x\ge\dfrac{2}{3}\)

b: ĐKXĐ: \(\left[{}\begin{matrix}\left\{{}\begin{matrix}y>0\\x>0\end{matrix}\right.\\\left\{{}\begin{matrix}y< 0\\x< 0\end{matrix}\right.\end{matrix}\right.\)

c: ĐKXĐ: \(x< \dfrac{15}{2}\)