以下为句子列表：
英文: Based on the solution set, the optimal approximation to a given matrix is constructed, and the necessary and sufficient conditions for the solvability of the problem are given and the expression for the solution is provided.
中文: 讨论了用双中心矩阵反问题的解构造给定矩阵的最佳逼近问题，给出该问题有解的充分必要条件和解的表达式。
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英文: In addition, in the solution set of corresponding equation, the expression of the optimal approximation solution to given matrix is derived.
中文: 另外，导出了在矩阵方程的解集合中与给定矩阵的最佳逼近解的表达式。
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