二重积分e^-(x+y)

2024-11-19 06:39:01
推荐回答(1个)
回答1:

解:
∫∫e^[-(x+y)]dxdy
=∫e^(-x)dx∫e^(-y)dy
=∫e^(-x)d(-x)∫e^(-y)d(-y)
=e^(-x)e^(-y)+C
=e^[-(x+y)]+C