(x1x2²+x1²x2-x1+x2)/x1x2怎么分解因式?

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(x1x2²+x1²x2-x1+x2)/x1x2怎么分解因式?
(x1x2²+x1²x2-x1+x2)/x1x2怎么分解因式?

(x1x2²+x1²x2-x1+x2)/x1x2怎么分解因式?
原式=[x1x2(x1-x2)-(x1-x2)]/x1x2
=(x1-x2)(x1x2-1)/x1x2

(x1x2² x1²x2-x1 x2)/x1x2
=x1x2(x2² x1²)-(x1-x2)/x1x2
=(x2² x1²)-(x1-x2)/x1x2