三、二重积分的性质 1jkf(x,No=kpJx,)do(k为常数) 2.JLf(x,y)±gx,yNo =川pf(x.)dc±n8x,do 3.对于任何常数a,B,都有 (+d=afd+(.da 4Jj八nfx,ydo=o/K,)do+,fcx,)do (D=DUD2,D1,D2无公共内点) BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS PRESS 返回 结束目录 上页 下页 返回 结束 三、二重积分的性质 D 1. k f (x, y)d ( k 为常数) D 2. [ f (x, y) g(x, y)]d 3.对于任何常数α,β,都有 D k f (x, y)d D D f (x, y)d g(x, y)d D D D [f (x, y) g(x, y)]d f (x, y)d g(x, y)d D 4. f (x, y)d ( , , ) D D1 D2 D1 D2无公共内点 1 2 ( , )d ( , )d D D f x y f x y