Question

Tìm TXĐ của hàm số 

Answer 1

ĐKXĐ:

a. \(\left\{{}\begin{matrix}x-1\ge0\\x^2-x-2\ne0\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x\ge1\\x\ne2\end{matrix}\right.\)

b. \(\left\{{}\begin{matrix}x-1\ne0\\x>0\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x\ne1\\x>0\end{matrix}\right.\)

c. \(\left\{{}\begin{matrix}2-x\ge0\\x+4>0\end{matrix}\right.\) \(\Leftrightarrow-4< x\le2\)

d. \(\left\{{}\begin{matrix}x-1\ge0\\\sqrt{x-1}\ne2\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x\ge1\\x\ne5\end{matrix}\right.\)

e. \(\left\{{}\begin{matrix}3-x\ge0\\x^2-x\ne0\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x\le3\\x\ne0\\x\ne1\end{matrix}\right.\)