原式=4x^2+3x^2-10x^2+3=(7x-3)(x-1)你有跳步，好象答案不对啊……答案绝对对原式=4x^2-（2x-x^2+2x-3-2x^2+6x)=4x^2+3x^2-10x^2+3=(7x-3)(x-1)