\(a,ĐK:5x+2\ge0\\ \Rightarrow x\ge-\dfrac{2}{5}\\ b,ĐK:3-2x\ge0\\ \Rightarrow-2x\ge-3\\ \Rightarrow x\le\dfrac{3}{2}\\ c,ĐK:7x-1\ge0\\ \Rightarrow x\ge\dfrac{1}{7}\)
\(d,ĐK:X-5\ge0\\ \Rightarrow X\ge5\)
\(E,ĐK:x+3>0\\ \Rightarrow x>-3\)
\(F,ĐK:1-2x>0\\ \Rightarrow-2x>-1\\ \Rightarrow x< \dfrac{1}{2}\)
\(G,\left\{{}\begin{matrix}x\ge0\\x+3>0\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}x\ge0\\x>-3\end{matrix}\right.\Rightarrow x\ge0\)
\(h,ĐK:\dfrac{-5}{2x+3}\ge0\)
Vì \(-5< 0\)
\(\Rightarrow2x+3< 0\\ \Rightarrow x< -\dfrac{3}{2}\)
\(K,ĐK:x^2-3x\ge0\)
\(\Rightarrow\left[{}\begin{matrix}x\le0\\x\ge3\end{matrix}\right.\)
\(I,ĐK:x^2+7\ge0\left(voli\right)\)
Vì \(x^2\ge0\forall x\\ 7>0\forall x\)
\(\Rightarrow x^2+7>0\)
=> vô nghiệm
