给定一维数组 a = [9, 8, 7], v = [3, 2, 1],它们的离散卷积结果是:()
[27, 42, 46, 22, 7]
[27,40, 44, 20, 7]
[27, 38, 46, 20, 7]
[27, 36, 48, 18, 7]
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