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A= 2-1 -5 3 2次行列可逆式 A= a b c d A^-1=[1/|A|]* d-b -c a (主対角線の位置変更、サブ対角線の符号変更) あなたの問題|A|=6-5=1 A^-1= 3 1 5 2
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