设函数f(x,y)具有一阶连续偏导数,且af(x,y)=yeydx+x(1+y)eydy,f(0,0)=0,则f(x,y)=_______.

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问题 设函数f(x,y)具有一阶连续偏导数,且af(x,y)=yeydx+x(1+y)eydy,f(0,0)=0,则f(x,y)=_______.

选项

答案xyey

解析 f’x=yey,f’y1=x(1+y)ey,f(x,y)=∫yeydx=xyey+c(y),
故f’y=xey+xyey+c’(y)=xey+xyey,故c’(y)=0,即c(y)=c,由f(0,0)=0,即f(x,y)
=xyey
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