吉禄学阁高粉答主2009-02-22教育达人关注e^(x+y)+sin(xy)=1e^(x+y)*(1+y')+cos(xy)(y+xy')=0y'*[e*(x+y)+xcos(xy)]=-[ycos(xy)+e^(x+y)]y'=-[ycos(xy)+e^(x+y)]/[e*(x+y)+xcos(xy)]x=0,求出y=0,代入上式,得到y'(x=0)=-1.