曲线y=[(x2-3x+2)/(x2-1)]e-x的铅直渐近线为________.

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问题 曲线y=[(x2-3x+2)/(x2-1)]e-x的铅直渐近线为________.

选项

答案x=-1,x=0

解析=∞得x=-1为铅直渐近线;
=-∞得x=0为铅直渐近线;
=-e/2得x=1不是铅直渐近线.
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