企源知识库

设F(x，y)=xy+2lnx+3ny-1≡0，则y'等于()
A、-{y(xy+2)/[x(xy+3)]}
B、-{x(xy+2)/[y(xy+3)]}
C、-{x(xy+3)/[y(xy+2)]}
D、-{y(xy+3)/[x(xy+2)]}
【正确答案】：A