∵192|a³+191∴192|a³-1∴2^6×3|(a-1)(a² +a +1)∵a²-a+1=a(a-1)+1,a(a-1)为偶数∴a²-a+1为奇数,只有可能整除3,∴a-1必定整除64当a=3n时,a² +a +1不整除3当a=3n+1时,a² +a +1=9...