123+234=?

123+234=? 123+234+345+456=? 123*234*345*456= 123+234+345+456+567+678=? 123+234+345+456+567= 123+234+345+456+567=? 123/234+123123/234234+123123123/234234234=? string str=123|234|456;怎么取到123,234,456啊 123?234?456? 123+234+345+456+567+678+789+900=? 123+234+345+456+567+678=?求简便算法 123+234+345+456+567+678+789+890+901=? 一道数学题：123*321*789-345*234=? 请问234+123等于几? 找规律123 234 347 123^2+234^2+345^2+2*123*234-2*123*345-2*234*345 123+123+123+123+123+123+123+123+123+123-123-123-123-123-123=? 123+234+345-456+567+678-789+890=怎么简便运算