练习：求 A(a)的不变因子0002an020an-1A(a)0an0a+a答案：d(a)=...=dn+(a)=1,d,(a)=A(a) =an +an-ia+...+a,an-I + a"88.3不变因子A§8.3 不变因子 练习：求 A( )  的不变因子 ( ) 1 2 1 0 0 0 1 0 0 0 0 0 0 0 0 1 n n a a A a a      −     − =       − +   答案: ( ) ( ) 1 1 1 , n d d   = = = + ( ) ( ) 1 1 1 . n n n n n d A a a a      − = = + + + + −