Question

已知7,56,176被自然数除所得的余数分别为a-1,a^2,a^3-1

Answer 1

7/2=3------------1,1=a-1,a=2.

56/13=4---------4,4=a²,a=2

176/13=13------7,7=a³-1,a=2

a=2