1. Prove that if an integer a is such that a — 2 is divisible by 3, then α2- 1 is divisible by 3. (20%)

詳解 (共 1 筆)

ChHautBrion
ChHautBrion
詳解 #3002175
2018/09/21
If 3|(a-2)Then a-2=3...
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