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【简答题】
研究两个有限长序列x(n)与y(n)，当n＜0、n≥40和9＜n＜30时，x(n)为0，并且n＜10和n＞19时，y(n)为0，如图2-8所示。令ω(n)为x(n)与y(n)的线性卷积，g(n)为x(n)与y(n)的40点循环卷积，即
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