概率论提高数字特征概率统计做题本（一）解答版填空题不看本题本题讨论已掌握查看解析收入错题#9012设 (X,Y)∼N(1,1,2,2;0),U=X+2Y,V=X−2Y\left({X,Y}\right) \sim N\left({1,1,2,2;0}\right),U = X + {2Y},V = X - {2Y}(X,Y)∼N(1,1,2,2;0),U=X+2Y,V=X−2Y，则 ρUV={\rho }_{UV} =ρUV=‾\underline{\hspace{7.5em}}.