Question

tìm abc biết :

abc*9=3abc

Answer 1

abc x 9 = 3abc

abc x 9 = 3000+abc ( bớt cả hai vế đi 1 lần abc)

abc x 8 = 3000

abc     = 3000 : 8

abc    = 375

tích nha 

Answer 2

abc x 9 = 3abc

abc x 9 = 3000 + abc (cấu tạo số )

abc x 9 - abc = 3000

abc x 8 = 3000

abc = 3000 : 8

abc = 375

tick nha

Answer 3

abc x 9 = 3abc

=> abc x 9 = 3000 + abc

=> abc + abc x 8 = abc + 3000

=> abc x 8 = 3000

=> abc = 3000 : 8

=> abc = 375

Answer 4

abc x 9 = 3abc

abc x 9 - abc = 3000 + abc - abc

abc x 8 = 3000

abc = 300 : 8

abc = 375