不对吧,应该是下面的x1²-1/x1-x2²+1/x2=(x1²-x2²)-(1/x1-1/x2)=(x1+x2)(x1-x2)-(x2-x1)/x1x2=(x1+x2)(x1-x2)+(x1-x2)/x1x2=(x1-x2)(x1+x2+1/x1x2)如果不懂,祝学习愉快!