又XiX...(61,62,..,8n)A=0(5)=(081,082,,08n)Xn(xn)81.8...,8nyn(xn)y1=A由于1,2,,8n线性无关,所以(Jn)87.3线性变换的矩阵K§7.3 线性变换的矩阵 ( ) 1 2 1 2 ( ) , , , n n x x x = 又 ( ) 1 2 1 2 , , n n x x A x = , ( ) ( ) 1 1 2 2 1 2 1 2 , , , , n n n n y x y x A y x = , , 由于 1 2 , , , n 线性无关,所以 1 1 2 2 n n y x y x A y x =