lim x→无穷 (x+4/x+2)^x,求极限
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求极限lim x趋向无穷 根号(x^2+x)下 - x
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求lim(x-正无穷)2x^2-3x-4/根号下x^4+1的极限
用洛必达法则求极限 lim→正无穷x×[(根号x^2+1)-x]
求极限lim(x→无穷)(1+1/(1-x))^2x