10≤F(x,y)≤1; 2F(x,y)是x,y的单调非减函数 3F(x,-∞)=F(-∞,y)=0,F(+∞,+∞)=l 4当D为不等式1≤x≤x2,y≤y≤y2所确定 矩形区域时, P(X,)∈D}= F(x12y1)+F(x2,y2)-F(x12y2)-F(x2,y1)1 0 ( , ) 1; 0  F x y  2 0 F(x, y)是x, y的单调非减函数； 3 ( , ) ( , ) 0, ( , ) 1; 0 F x − = F − y = F + + = 4 0 当D为不等式x1  x  x2 , y1  y  y2 所确定 矩形区域时， P{( X ,Y)  D} = ( , ) ( , ) ( , ) ( , ). 1 1 2 2 1 2 2 1 F x y + F x y − F x y − F x y