模运算 ■例:Z8={0,1,23,4,5,6,7模8加法和乘法 +01234567×01234567 00123456700000000|0 112345670101234567 223456701|202460246 |3345670121303614725 456 012340404040 556701234505274163 66 0 23451606420642 770123456707654321 2021/2/212021/2/21 7 模运算 ◼ 例：Z8={0,1,2,3,4,5,6,7},模8加法和乘法 ＋ 0 1 2 3 4 5 6 7 0 0 1 2 3 4 5 6 7 1 1 2 3 4 5 6 7 0 2 2 3 4 5 6 7 0 1 3 3 4 5 6 7 0 1 2 4 4 5 6 7 0 1 2 3 5 5 6 7 0 1 2 3 4 6 6 7 0 1 2 3 4 5 7 7 0 1 2 3 4 5 6 × 0 1 2 3 4 5 6 7 0 0 0 0 0 0 0 0 0 1 0 1 2 3 4 5 6 7 2 0 2 4 6 0 2 4 6 3 0 3 6 1 4 7 2 5 4 0 4 0 4 0 4 0 4 5 0 5 2 7 4 1 6 3 6 0 6 4 2 0 6 4 2 7 0 7 6 5 4 3 2 1