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更新矩阵
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@@ -273,6 +273,7 @@ $f(A)=A^2-A-6E=(A+2E)(A-3E)$。
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\begin{itemize}
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\item $\vert A^T\vert=\vert A\vert$。
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\item $\vert A^{-1}\vert=\dfrac{1}{\vert A\vert}$。
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\item $\vert\lambda A\vert=\lambda^n\vert A\vert$。
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\item $\vert AB\vert=\vert A\vert\cdot\vert B\vert=\vert BA\vert$。
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\end{itemize}
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