设I=∫01dy∫0eyf(x,y)dx,则交换积分次序后得I=____.

设I=∫01dy∫0eyf(x,y)dx,则交换积分次序后得I=____.
【正确答案】:∫01dx∫01f(x,y)dy+∫1edx∫lnx1f(x,y)dy