Ta có
( 30 x 1000 + abc ) : abc = 241
30 x 1000 + abc = 241 x abc
30 x 1000 = 240 x abc
30 000 = 240 x abc
30 000 : 240 = abc
125 = abc
30abc:abc=241
30abc =241*abc
30000+abc=241*abc
30000=240*abc
abc=30000:240
abc=125
30abc : abc =241 hay
(30000+abc) : abc =241
30000 :abc+ abc :abc=241
30000:abc+1=241
30000:abc=241-1
30000:abc=240
abc=30000:240
abc=125