å
æ±ä¸å®ç§¯åï¼
=â«lnxdx
=xlnx-â«xd(lnx)
=xlnx-â«dx
=xlnx-x
æ以å®ç§¯å=elne-e-(1ln1-1)=e-e-0+1=1.
=â«lnxdx
=xlnx-â«xd(lnx)
=xlnx-â«dx
=xlnx-x
æ以å®ç§¯å=elne-e-(1ln1-1)=e-e-0+1=1.
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