\(a,\)\(2-\sqrt{1-4x}\)
\(đkxđ\Leftrightarrow\sqrt{1-4x}\ge0\)
\(\Rightarrow1-4x\ge0\)\(\Rightarrow x\le\frac{1}{4}\)
\(b,\)\(\sqrt{2x+1}+\frac{2}{3-4x}\)
\(đkxđ:\orbr{\begin{cases}2x+1\ge0\\3-4x\ne0\end{cases}\Rightarrow\orbr{\begin{cases}x\ge-\frac{1}{2}\\x\ne\frac{3}{4}\end{cases}}}\)
\(c,\)\(\sqrt{\frac{-3}{2x-2}}\)
\(đkxđ:\hept{\begin{cases}\frac{-3}{2\left(x-1\right)}\ge0\\x\ne1\end{cases}}\)
\(\frac{-3}{2\left(x-1\right)}>0\Leftrightarrow2\left(x-1\right)>0\)
\(\Rightarrow x-1>0\Rightarrow x>1\)
\(d,\)\(\frac{1}{4x+2}+\sqrt{1+3x}\)
\(đkxđ:\hept{\begin{cases}2\left(x+1\right)\ne0\\1+3x\ge0\end{cases}\Rightarrow\hept{\begin{cases}x+1\ne0\\3x\ge-1\end{cases}\Rightarrow}\hept{\begin{cases}x\ne-1\\x\ge\frac{-1}{3}\end{cases}}}\)
À câu b sửa cho mình ngoặc vuông thành ngoặc móc giùm mình nha. Mình nhầm xíu :>
