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並前往https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:matrices/x9e81a4f98389efdf:properties-of-matrix-multiplication/a/intro-to-identity-matrices

Identity matrix: intro to identity matrices (article) | Khan Academy

The entries on the diagonal from the upper left to the bottom right are all 1 1 11's, and all other entries are 0 0 00. For example:.

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