1) \(x-5=4m+1\Leftrightarrow x=4m+6>0\Leftrightarrow m>-\dfrac{3}{2}\) Chọn Câu B
2) \(3x-5=2-4m\Leftrightarrow x=\dfrac{7-4m}{3}< 0\Leftrightarrow7-4m< 0\Leftrightarrow m>\dfrac{7}{4}\) Chọn Câu C
3) \(2-3x=5m-7\Leftrightarrow x=\dfrac{9-5m}{3}\le0\Leftrightarrow9-5m\le0\Leftrightarrow m\ge\dfrac{9}{5}\) Chọn Câu A
4) \(7x-21=15-4m\Leftrightarrow x=\dfrac{36-4m}{7}\ge0\Leftrightarrow36-4m\ge0\Leftrightarrow m\le9\) Chọn Câu B
5) \(\dfrac{x^2+5}{x-3}\le0\Leftrightarrow x-3\le0\Leftrightarrow x\le3\) Chọn Câu B
6) \(\dfrac{2x+3}{5}-\dfrac{1}{2}\ge0\Leftrightarrow4x+6-5\ge0\Leftrightarrow x\ge-\dfrac{1}{4}\) Chọn Câu B