Question

abcd + abc,d + ab,cd + a,bcd = 2238,665
 tìm abcd = ?

Answer 1

abcd = 2238,665 : ( 1 + 10 + 100+1000 ) x 1000 = 2015

=> abcd = 2015          

Answer 2

1111a+111,1b+11,11c+1,111d=2238,665

 a,bcd=2238,665:1111=2,015

   Vậy ABCD=2015