[0 1 2 3] [3 2 1 0] [-1 2 3 4]A=[1 3 1 4] B= [2 -1 -1 1] C= [0 2 0 -1][2 0 3 1] [0 -1 3 2] [-1 1 3 1]求(1)A+2B (2)A+B-C

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