计算重积分(1/(x-y)^2)dxdy,其中区域是1<x<2,3<y<4,
问题描述:
计算重积分(1/(x-y)^2)dxdy,其中区域是1<x<2,3<y<4,
答
∫dx∫dy/(x-y)²=∫[1/(x-4)-1/(x-3)]dx
=[ln│x-4│-ln│x-3│]│
=ln2-ln1-ln3+ln2
=2ln2-ln3.