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Explain the second small problem of advanced mathematics. I think choose a and answer d.
lim & ltx→-∞& gt； 1/( 1+e^x)= 1/( 1+0)= 1

lim & ltx→+∞& gt； 1/( 1+e^x) = 0，

If the left and right limits are not equal, the limit does not exist. Choose D.

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