x~u(0,1),概率密度函数fX(x)=1 , 00 , 其他概率分布函数FX(x)=0 , x<=0x , 01, x>1(1)Y=e^X 范围是(1,e)所以FY(y) = P{Y<=y} = P{e^X<=y} = 0, y<=1lny, 11, y>efY(y) = FY(y)' = 1/y, 10, 其他
