lim x→5 x-5/x/1-x/5

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lim x→5 x-5/x/1-x/5
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lim(x→∞)[(X^2+2x+5)/(3x^2-x+1)=lim(x→∞)[(X^2+2x+5)/(3x^2-x+1)=lim(x→∞)[(X^2+2x+5)/(3x^2-x+1)=无穷大时只考虑

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lim(x→0)(3x^2-5x+2),lim(x→0)(3x^2-5x+2),lim(x→0)(3x^2-5x+2),这不是分式,把0直接代入就行了=2

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