问题标题:
lim(x-2/x+2)^x+2x→∞请问这题求极限是怎样解,
问题描述:

lim(x-2/x+2)^x+2x→∞请问这题求极限是怎样解,

贺宝权回答:
  lim_{x→∞}[(x-2)/(x+2)]^(x+2)   =lim_{x→∞}[1-4/(x+2)]^(x+2)   =lim_{x→∞}[1-4/(x+2)]^[-(x+2)/4*(-4)]   =lim_{x→∞}{[1-4/(x+2)]^[-(x+2)/4]}^(-4)   =e^(-4)
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