7的倍数：7.14.21.28.35.42.49.56.63.70.77.84.91.98.105.112.119.126.133.12的倍数：12.24.36.48.60.72.84.96.108.120.132.144.156.168.180.192.204.216.228.240.7和12的公倍数：84.168.336.