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链接：https://baike.baidu.com/item/MOD%E8%BF%90%E7%AE%97/7885553?fr=aladdin1）模p运算
2）模p相等如果两个数a、b满足a mod p = b mod p，则称他们模p相等，记做a ≡ b mod p
2）模p相等如果两个数a、b满足a mod p = b mod p，则称他们模p相等，记做a ≡ b mod p