Question

Answer 1

a) A có nghĩa `<=>3x-5>=0<=>x>=5/3`

b) B có nghĩa `<=> -3/(4-5x)>=0 <=>4-5x<0<=>x>4/5`

Answer 2

a) ĐKXĐ: \(x\ge\dfrac{5}{3}\)

b) ĐKXĐ: \(4-5x< 0\)

\(\Leftrightarrow5x>4\)

hay \(x>\dfrac{4}{5}\)