Câu hỏi của Thùy Mai

a, đk x khác -1 ; 2 \(2x-4-x-1=3x-11\Leftrightarrow x-5=3x-11\Leftrightarrow2x=10\Leftrightarrow x=5\left(tm\right)\)b, \(6x-4-60=9-6\left(x+7\right)\Leftrightarrow12x-31=0\Leftrightarrow x=\dfrac{31}{12}\)c, \(2x^2+3x-2=15x^2-13x+2\Leftrightarrow13x^2-16x+4=0\Leftrightarrow x=\dfrac{8\pm2\sqrt{3}}{13}\)Câu trả lời: a, đk x khác -1 ; 2 \(2x-4-x-1=3x-11\Leftrightarrow x-5=3x-11\Leftrightarrow2x=10\Leftrightarrow x=5\left(tm\right)\)b, \(6x-4-60=9-6\left(x+7\right)\Leftrightarrow12x-31=0\Leftrightarrow x=\dfrac{31}{12}\)c, \(2x^2+3x-2=15x^2-13x+2\Leftrightarrow13x^2-16x+4=0\Leftrightarrow x=\dfrac{8\pm2\sqrt{3}}{13}\)