e^y×y‘-y-xy’=0
(e^y-x)y‘=y
y'=y/(e^y-x)当x等于0的时候，结果是多少。速y'=y/e^y书上给的答案是e分之一，对，我直接代入了e^y-0-e=0∴y=1y'=y/e^y=1/e^1=1/e