SAT一道数学题，求解！谢谢！
Thegraphof(x^2-1)y=x^2-4has:A.onehorizontalandoneverticalasymptotesB.twoverticalbutno...
The graph of (x^2-1)y=x^2-4has:
A. one horizontal and one vertical asymptotes
B. two vertical but no horizontal asymptotes
C. one horizontal and two vertical asympototes
D. two horizontal and two vertical asymptotes
E.neither a horizontal nor a vertical asymptote 展开
A. one horizontal and one vertical asymptotes
B. two vertical but no horizontal asymptotes
C. one horizontal and two vertical asympototes
D. two horizontal and two vertical asymptotes
E.neither a horizontal nor a vertical asymptote 展开
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答案为E
正确解法：用x表示y，如果分子中x的指数大于分母中x的指数，则无asymptotes
同理，用y表示x，如果分子中y的指数大于分母中y的指数，则无asymptotes
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