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a, \(8x\ge9\Leftrightarrow x\ge\dfrac{9}{8}\)b, \(3-2x\le5x-35\Leftrightarrow7x\le38\Leftrightarrow x\le\dfrac{38}{7}\)c, \(\dfrac{3x-9+2x+1-30x}{15}\ge0\Rightarrow-25x-8\ge0\Leftrightarrow x\le-\dfrac{8}{25}\)d, \(x^2-6x+9-x^2+1 5\Leftrightarrow x>\dfrac{1}{2}\)Câu trả lời: a, \(8x\ge9\Leftrightarrow x\ge\dfrac{9}{8}\)b, \(3-2x\le5x-35\Leftrightarrow7x\le38\Leftrightarrow x\le\dfrac{38}{7}\)c, \(\dfrac{3x-9+2x+1-30x}{15}\ge0\Rightarrow-25x-8\ge0\Leftrightarrow x\le-\dfrac{8}{25}\)d, \(x^2-6x+9-x^2+1 5\Leftrightarrow x>\dfrac{1}{2}\)