Ch3-7 联合分布函数的性质 +0.+ ④0≤F(x,y)s1影缴 F(+∞,+0)=1 XX F( (-0,-0)Ch3-7 联合分布函数的性质 F( , ) 0 − −  = (+,+) x y (x, y) x y (−,−) 0  F(x, y) 1 F( , ) 1 + +  = ①