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一、形如(?)P(x)/Q(x)(或x→∞)的不定式,可换元y=x-x_0。例1.(?)2x~2/((x+1)-(1+3x)~(1/3))。
An infinitive of the form (?)P(x)/Q(x) (or x→∞), which can be replaced by y=x-x_0. Example 1. (?) 2x~2/((x+1)-(1+3x)~(1/3)).