Question

mn giúp e với ạ e cảm ơn

Answer 1

a, \(-4+7x-5+2x>0\Leftrightarrow9x-9>0\Leftrightarrow x>1\)

b, \(\dfrac{2x+15}{9}-\dfrac{x-1}{5}-\dfrac{x}{3}\ge0\)

\(\Leftrightarrow\dfrac{10x+75-9x+9-15x}{9}\ge0\Rightarrow-14x+84\ge0\Leftrightarrow x\le6\)

c, \(2x^2+8x+8< 2x^2+4x+4\Leftrightarrow4x+4< 0\Leftrightarrow x< -1\)