a) \(đkxđ\)\(\left\{{}\begin{matrix}x\ge0\\x\ne9\\x\ne1\end{matrix}\right.\)
K viết lại đề nhé
\(M=\left(\frac{x+2\sqrt{x}-7}{x-9}+\frac{1-\sqrt{x}}{\sqrt{x}-3}\right):\left(\frac{1}{\sqrt{x}+3}-\frac{1}{\sqrt{x}-1}\right)\)
\(\Leftrightarrow\frac{x+2\sqrt{x}-7+\left(1-\sqrt{x}\right)\left(\sqrt{x}+3\right)}{\left(\sqrt{x}-3\right)\left(\sqrt{x}-3\right)}:\frac{\sqrt{x}-1-1\left(\sqrt{x}+3\right)}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-1\right)}\)
\(\Leftrightarrow\frac{x+2\sqrt{x}-7+\sqrt{x}+3-x-3\sqrt{x}}{\left(\sqrt{x}-3\right)\left(\sqrt{x}+3\right)}.\frac{\left(\sqrt{x}+3\right)\left(1-\sqrt{x}\right)}{4}\)
\(\Leftrightarrow\frac{4}{\sqrt{x}-3}.\frac{1-\sqrt{x}}{4}\)
\(\Leftrightarrow\frac{1-\sqrt{x}}{\sqrt{x}-3}\)
b+c bạn tự làm tiếp nha