+ 0002A(2) =0解:1)A(α)的非零1级子式为:0 (a+1)0?+, , (a+1).:: D(a)=1A(a)的非零二级子式为:a2?+0=2"(a+1),[0 (a+1)=2,20a2+a0(a +1)= a(a+1)°.088.3不变因子V§8.3 不变因子 ( ) 2 2 + + , , 1 . ( ) 1 = D 1 A( ) 的非零二级子式为: ( ) 2 0 2 1 , 0 + = + ( ) ( ) 2 3 2 0 1 . 0 1 + = + + 解:1) A( ) 的非零1级子式为: ( ) 2 0 , 0 1 = + ( ) 2 2 0 0 ( ) 0 0 0 0 1 A + = +