limx->1求极限(x/x-1 - 1/lnx)
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limx->1 (x/x-1 - 1/lnx)
=limx->1 (xlnx-x+1)/[(x-1)lnx] (0/0)
=limx->1 lnx/[lnx+(x-1)/x]
=limx->1 xlnx/[xlnx+(x-1)] (0/0)
=limx->1 (lnx+1)/[lnx+2]
=1/2
=limx->1 (xlnx-x+1)/[(x-1)lnx] (0/0)
=limx->1 lnx/[lnx+(x-1)/x]
=limx->1 xlnx/[xlnx+(x-1)] (0/0)
=limx->1 (lnx+1)/[lnx+2]
=1/2
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lim(x->1)[ x/(x-1) - 1/lnx ]
=lim(x->1) [xlnx-(x-1)]/[(x-1)lnx] (0/0)
= lim(x->1) [ (1+lnx-1) / (lnx + (x-1)/x) ]
= lim(x->1) [ xlnx/(xlnx+(x-1) ] (0/0)
= lim(x->1) [ (lnx+1)/(x+1+1) ]
=1/2
=lim(x->1) [xlnx-(x-1)]/[(x-1)lnx] (0/0)
= lim(x->1) [ (1+lnx-1) / (lnx + (x-1)/x) ]
= lim(x->1) [ xlnx/(xlnx+(x-1) ] (0/0)
= lim(x->1) [ (lnx+1)/(x+1+1) ]
=1/2
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