(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2 这一步怎么推出来的,(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2 这一步怎么推出来的,

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(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2这一步怎么推出来的,(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2这一步怎

(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2 这一步怎么推出来的,(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2 这一步怎么推出来的,
(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2 这一步怎么推出来的,
(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2 这一步怎么推出来的,

(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2 这一步怎么推出来的,(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2 这一步怎么推出来的,
通分
分子=x1x2(x1-x2)-(x1-x2)
=(x1-x2)(x1x2-1)

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

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

(x1-x2)+(x2-x1)/(x1x2)
=(X1-X2)*[1-1/(X1*X2)]
=(X1-X2)*[(X1*X2-1)/X1*X2]