a) Ta có: \(\sqrt{3x-2}>5\)
nên 3x-2>25
\(\Leftrightarrow3x>27\)
hay x>9
b) Ta có: \(\sqrt{2x-7}< 9\)
\(\Leftrightarrow2x-7< 81\)
\(\Leftrightarrow2x< 88\)
hay x<44
Kết hợp ĐKXĐ, ta được: \(\dfrac{7}{2}\le x< 44\)
c) Ta có: \(\sqrt{2x-3}>\sqrt{x-9}\)
\(\Leftrightarrow2x-3>x-9\)
\(\Leftrightarrow2x-x>-9+3\)
\(\Leftrightarrow x>-6\)
Kết hợp ĐKXĐ, ta được: \(x\ge\dfrac{3}{2}\)
d) Ta có: \(\sqrt{x-3}< \sqrt{5-2x}\)
\(\Leftrightarrow x-3< 5-2x\)
\(\Leftrightarrow x+2x< 5+3\)
\(\Leftrightarrow3x< 8\)
hay \(x< \dfrac{8}{3}\)