设xy-e^xy=e 求dy/dx是=-y/x吧?
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设xy-e^xy=e 求dy/dx是=-y/x吧?
设xy-e^xy=e 求dy/dx
是=-y/x吧?
设xy-e^xy=e 求dy/dx是=-y/x吧?
两边对x求导 y+xy'-(y+xy')e^xy=0
然后把y'解出来就ok
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