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求 A = {{ 0, 1, 0 }, {0, 0, 1 }, {0, 0, 0 }} 的 。 呢？（幂零。）
求 A = {{ 0, 1, 0 }, {0, 0, 1 }, {0, 0, 0 }} 的 。 呢？（幂零。）
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