在P^4中求由基ε1,ε2,ε3,ε4到基n ,72,n3,n4的过渡-|||-矩阵,并求向量ξ在所指基下的坐标.设-|||-(1) ) (varepsilon )_(1)=(1,0,0,0) (varepsilon )_(2)=(0,1,0,0) (varepsilon )_(3)=(0,0,1,0) (varepsilon )_(4)=(0,0,0,1) .-|||-,-|||-, ,-|||-xi =(1,0,1,-1) 在n1,n2,n3,n下的坐标.