习题 1.2 题随机变量UND 与 Y相互独 立,且-|||- Xleqslant 1 =P YY1 =dfrac (2)(5) 则 max(x,Y)leqslant 1 =-|||-(A) dfrac (2)(5); (B) 4/5; (C) dfrac (4)(25); (D) dfrac (6)(25).