求矩阵的解,A为4阶魔方阵,。【提示】由rref可以看出A不满秩,b不在A的值空间中,方程没有准确解。但可求最小二乘近似解。【目的】A不满秩,b不在A的值空间中,方程没有准确解。【解答】(1)借助增广矩阵用指令rref求解
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