问题 选择题 如果(x6+2x4-4x2)÷M=-12x4-x2+2,那么M代表的单项式是( )A.12x2B.-2x2C.-12x2D.2x2 答案 M=(x6+2x4-4x2)÷(-12x4-x2+2)=-2x2(x4+2x2-4)÷(x4+2x2-4)=-2x2.故选B.