abcd = 1000 x a,bcd
abc,d = 100 x a,bcd
ab.cd = 10 x a,bcd
Nên:
abcd + abc,d + ab,cd + a,bcd = a,bcd x (1000 + 100 + 10 + 1) = 1111 x a,bcd
Hay
1111 x a,bcd = 2238,665
a,bcd = 2238,665 : 1111
a,bcd = 2,015
Vậy:
abcd = 2015
Phải là abcd+abc,d+ab,cd+a,bcd=2238,665
abcd+abc,d+ab,cd+a,bcd=2238,665
=>1000 . a,bcd + 100 . a,bcd + 10 . a,bcd +a,bcd . 1 = 2238,665
=>a,bcd (1000+100+10+1) = 2238,665
=> 1111a,bcd = 2238,665
=> a,bcd = 2238,665 : 1111
=> a,bcd = 2,015
=> abcd = 2015