= (21-8v/2)/40. = (al-8 ja o example : evaluate x +y] dx dy, over the rectangle r = [o, 1: 0, 21, where [x+ y] denotes the greatest integer less than or equal t

= (21-8V/2)/40. = (al-8 Ja o Example : Evaluate x +y] dx dy, over the rectangle R = [O, 1: 0, 21, where [x+ y] denotes the greatest integer less than or equal to (x + y). We have, for (x, y) e R. 0, if 0sX+y<1 x+y]=1, if 1sx+y <2 2, if 2sx+y <3