证：由已知有O(8,82,..,8n) =(81,62,..,en)A,X5-(81,82,"",8nxnJi：0(5)=(e1,82,"",8nyn67.3线性变换的矩阵A§7.3 线性变换的矩阵 证：由已知有 ( ) 1 2 1 2 , , , n n x x x               ＝ , ( ) 1 2 1 2 ( ) , , . n n y y y          =       ,        ( 1 2 1 2 , , , , , , , n n ) = ( ) A