(x1-x2/x2x1)怎么化得1-(1/x2x1)

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(x1-x2/x2x1)怎么化得1-(1/x2x1)

(x1-x2/x2x1)怎么化得1-(1/x2x1)
(x1-x2/x2x1)怎么化得1-(1/x2x1)

(x1-x2/x2x1)怎么化得1-(1/x2x1)
楼主这式子……