1, \(2x+3x-6x=-x\)2, \(5x^2+\dfrac{3}{2}x^2-\dfrac{2}{3}x^2=\dfrac{35}{6}x^2\)3, \(-2x^2y+\dfrac{2}{7}x^2y-3x^2y=-\dfrac{33}{7}x^2y\)4, \(15x^2y^2+\dfrac{13}{2}x^2y^2-x^2y^2+\dfrac{x^2y^2}{2}=16x^2y^2\)5, \(3x^2y^2z-\dfrac{7}{2}x^2y^2z+\dfrac{1}{2}x^2y^2z=0\)6, \(-\dfrac{14}{5}x^ny^m-2x^ny^m+\dfrac{5}{2}x^ny^m=-\dfrac{23}{10}x^ny^m\)Câu trả lời: 1, \(2x+3x-6x=-x\)2, \(5x^2+\dfrac{3}{2}x^2-\dfrac{2}{3}x^2=\dfrac{35}{6}x^2\)3, \(-2x^2y+\dfrac{2}{7}x^2y-3x^2y=-\dfrac{33}{7}x^2y\)4, \(15x^2y^2+\dfrac{13}{2}x^2y^2-x^2y^2+\dfrac{x^2y^2}{2}=16x^2y^2\)5, \(3x^2y^2z-\dfrac{7}{2}x^2y^2z+\dfrac{1}{2}x^2y^2z=0\)6, \(-\dfrac{14}{5}x^ny^m-2x^ny^m+\dfrac{5}{2}x^ny^m=-\dfrac{23}{10}x^ny^m\)