从1到10000之间有几个整数,它们的各位数字之和都等于5?答:共56个 个位数1个:5 两位数5个:14,23,32,41,50 三位数15个:104,140,401,410,203,230,302,320,113,131,311,122,212,221 四位数35个:1004,1040,1400,4001,4010,4100,2003,2030,2300,3002,3020,3200,1013,1031,1103,1130,1301,1310,3011,3101,3110,1022,1202,1220,2012,2021,2102...