fA(4)=27 =”+an12n+…+a12+ao =(-A1)(-2)…(-2) 则-(41+12+…+2,)=an1=-∑an=-mA (-1)122…1=a0=(-1)"detA
6 1 1 1 0 1 2 ( ) ( )( ) ( ) A n n n n f I A a a a − − = − = + + + + = − − − 1 2 1 1 ( ) n n n ii i a a trA − = 则 − + + + = = − = − 1 2 0 ( 1) ( 1) det . n n − = = − n a A 11 1 1 n n nn a a I A a a − − − = − −
Chapterll Linear space §1线性空间的定义及性质 (1+1)(+B)=a+f++B 左=(1+1)+(1+1)=a+a+B+B 得a+B+a+B=a+a+B+B 两边左加-a,右加-B, 得a+B=+a -B=+(-β)
7 ChapterIII Linear Space §1 线性空间的定义及性质 (1+1)( + ) = + + + −=+ (−) D + + + = + + + = + + + = + + + 得 左 (1 1) (1 1) . + = + − − 得 两边左加 ， 右加