(x2-x1)/(x1x2)怎么化简

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(x2-x1)/(x1x2)怎么化简
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(x2-x1)/(x1x2)怎么化简
(x2-x1)/(x1x2)怎么化简

(x2-x1)/(x1x2)怎么化简
(X2-X1) (1/X2-1/X1) =(x2-x1) (x1-x2)/x1x2 =(x2-x1)(1-1/x1x2)