
因式分解这个,过程详细,谢谢
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X1+ 1/X1 - X2 - 1/X2
= (X1 - X2) + (1/X1 - 1/X2)
= (X1 - X2) + ( X2/(X1*X2) - X1/(X1*X2) )
= (X1 - X2) + (X2-X1)/(X1*X2)
= (X1 - X2) - (X1-X2)/(X1*X2)
= (X1 - X2)*(1 - 1/(X1*X2)
= (X1 - X2) + (1/X1 - 1/X2)
= (X1 - X2) + ( X2/(X1*X2) - X1/(X1*X2) )
= (X1 - X2) + (X2-X1)/(X1*X2)
= (X1 - X2) - (X1-X2)/(X1*X2)
= (X1 - X2)*(1 - 1/(X1*X2)
追问
虽然看起来有点不靠谱,但是
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