3^100.......是要拆成(3^5)^20
3^99.........是要拆成*(3^3)^33
除於幾,就看題目是要求幾位!末兩位就除100,末三位就除1000
3^100 的末兩位數字的和是(A)1 (B)3 (C)9 (D)15-阿摩線上測驗