Question

tìm abc :

 9abc - abc9 = 4473

abc9 - 5778 = 9abc

 

Answer 1

618

A)9abc       =4473+abc9

   9000+abc=4473+abcx10+9

   9000       =4482+abcx(10-1)

   9000-4482=abcx9

   4518        =abcx9 => 4518:9=502

b) abcx10+9+5778=9000+abc

    abcx10+5787   =9000+abc

    abcx(10-1)       =9000-5787

    abcx9             =3213 => 3213:9=357

Answer 2

Câu đầu: abc=502 Câu sau: abc=357

Answer 3

9502 - 5029= 4473