123456*97876543-12345*9876544急!请火速回答谢谢.请 写详细一点，最好是算试 用简便方法。谢谢

123+1234+12345+123456 123456*97876543-12345*9876544急!请火速回答谢谢.请 写详细一点，最好是算试 用简便方法。谢谢 1234+12345+123456+1234567+12345678= 123+1234+12345+123456+1234567+12345678+123456789 12+123+1234+12345+123456+1234567= 12+123+1234+12345+123456+1234567+12345678+123456789+1234567890=? 1+12+123+1234+12345+123456+123456789=? 1+1+12+123+1234+12345+123456+1234567+12345678+123456789 123456+123456-123456-123456 123456 123456 123456 123456 123456 123456 .123456* 123456789+12345678+1234567+123456+12345+1234+123+12+1+0＝? 1+12+123+1234+12345+123456+1234567+12345678+123456789的末三位数字