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[概率/统计] 方格中放向量

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aishuxue Posted at 2025-3-21 10:25:09 |Read mode
Last edited by hbghlyj at 2025-3-21 16:41:09将 9 个互不相同的向量 `\bm a_i=(x_i,y_i)`, `x_i`, `y_i\in\{-1,0,1\}`, `i=1`, `2`, `\dots`, `9`,填入 `3\times3` 的方格中,使得每行、每列的三个向量的和都相等,则不同的填法种数是________

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爪机专用 Posted at 2025-3-21 11:08:24
I am majia of kuing

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2025-4-21 01:24 GMT+8

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