[中學] 矩陣問題
請問一下第七題第4選項
依題意可知AB=BA
即. B(inverse)AB=A 成立
故B(inverse)存在
但實際算出來b=-2
即det(B)=0 => B(inverse)不存在
感覺是我觀念錯誤,但不知道我的推論哪裡出錯,請幫忙指導一下,謝謝!
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