Re: [中學] 矩陣一問
※ 引述《phoneing (翔浪)》之銘言:
: A=[ 1 -1 ]
: [ 1 1 ]
: 求 A^10
: 如果直接做十次應該是可以做出答案
: 請問有比較簡便的方法 或者其他的方法呢
: 謝謝
找規律
A^2 = [ 1 -1 ][ 1 -1 ] = [ 0 -2 ]
[ 1 1 ][ 1 1 ] [ 2 0 ]
A^4 = [ 0 -2 ][ 0 -2 ] = [-4 0 ]
[ 2 0 ][ 2 0 ] [ 0 -4 ]
A^8 = [-4 0 ][-4 0 ] = [16 0 ]
[ 0 -4 ][ 0 -4 ] [ 0 16 ]
A^10 = A^8 A^2 = [16 0 ][ 0 -2 ] = [ 0 -32 ]
[ 0 16 ][ 2 0 ] [32 0 ]
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