(x1x2²+x1²x2-x1+x2)/x1x2怎么分解因式?

问题描述:

(x1x2²+x1²x2-x1+x2)/x1x2怎么分解因式?

原式=[x1x2(x1-x2)-(x1-x2)]/x1x2
=(x1-x2)(x1x2-1)/x1x2