lim (x-2/x+2)^x+2 x→∞ 请问这题求极限是怎样解,
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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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