3d = 1 mod 40怎么算

3d = 1 mod 40

相当于(3*d-1) = 40*n

n=1 , d=41/3 整除不了

n=2, d=81/3=27

所以求得d=27

原文地址:https://www.cnblogs.com/LiQingXin/p/13194289.html