问题 选择题 limx→1x2-3x+2x2-1等于( )A.-12B.12C.1D.0\mathop limits 答案 limx→1x2-3x+2x2-1=limx→1(x-1)(x-2)(x-1)(x+1)=limx→1x-2x+1=-12.故选A.