阿摩線上測驗
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阿摩線上測驗
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二、 1. Let A, B, C be p×q, m×n, n×p matrices and denote the (i, j)-entries of A, B, C by 
respectively.
(a) Please write down the (i,j)-entry of the product BCA in terms of Sigma notations (i.e. Σ).