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关于本题的两点疑问？ 跪求大牛解释....为什么extend_euclid(a, b, x, y)， 当a, b 存在负数的情况也可以正确得出结果？ 为什么这一题算出x后，还有mod b ？ (是否与a, b的正负有关? 当a, b 都为正的时候， 就不用mod b， 为负的时候，需要mod b) Followed by:
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