207乘以208208减去208乘以207乘以207
=207×208×1001-208×207×207
=207×208×（1001-207）
=207×208×794
=34186464
207乘以208208减去208乘以207乘以207怎样简便计算
207乘以208208减去208乘以207乘以207
=207×208×1001-208×207×207
=207×208×（1001-207）
=207×208×794
=34186464