称T为线性映射或线性变换，若对于vV;wW和所有标量c，映射T满足线性关系式T(v+w)=T(v)+T(w)(.)和T(cv)=cT(v)(.)√判断题均值向量考查m£随机向量x(»)=[x(»);x(»);¢¢¢;xm(»)]T