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置换矩阵 P = {{ 0, 1, 0 }, {1, 0, 0 }, {0, 0, 1 }} 的逆。（答：。）
置换矩阵 P = {{ 0, 1, 0 }, {1, 0, 0 }, {0, 0, 1 }} 的逆。（答：。）
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