求极限：lim(1/x－1/(e^x－1)) x趋向于0

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lim(x→0)(1/x－1/(e^x－1))
=lim(x→0)(e^x－1-x)/[x(e^x－1)]
=lim(x→罩猜0)(e^x－1-x)/x^2
=lim(x→物空型0)(e^x－亏旦1)/(2x)
=lim(x→0)x/(2x)
=1/2

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