Đáp án:
\(\begin{array}{l}
a)x \ne 0\\
b)x \ne 3\\
c)x \ne 9\\
d)x \ne - 5\\
e)x \ne - 8\\
f)x \ne 4
\end{array}\)
Giải thích các bước giải:
\(\begin{array}{l}
a)DK:x \ne 0\\
b)DK:x - 3 \ne 0\\
\to x \ne 3\\
c)DK:9 - x \ne 0\\
\to x \ne 9\\
d)DK: - 2x - 10 \ne 0\\
\to - 2x \ne 10\\
\to x \ne - 5\\
e)DK:\dfrac{1}{2}x + 4 \ne 0\\
\to \dfrac{1}{2}x \ne - 4\\
\to x \ne - 8\\
f)DK:6 - \dfrac{3}{2}x \ne 0\\
\to \dfrac{3}{2}x \ne 6\\
\to x \ne 4
\end{array}\)
