xy=e^x+y 确定隐函数y的导数dy/dx
问题描述：
xy=e^x+y 确定隐函数y的导数dy/dx
答
xy = e^x +y
xy' + y = e^x + y'
y'(1-x) = y -e^x
y' = (y-e^x)/(1-x)