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通过 [A|I] 消元法求 {{ 1, 2, 1 }, {0, 1, 1 }, {0, 0, 1 }} 的 。
通过 [A|I] 消元法求 {{ 1, 2, 1 }, {0, 1, 1 }, {0, 0, 1 }} 的 。
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