Question

Tìm số abc biết :

                               1abc = abc  x 9

Trả lời :

Số abc là .........

Answer 1

1abc=abc x 9

1000+abc=abc x 9

1000=abc x 9-abc

1000=abc x (9-1)

1000=abc x 8

abc=1000:8

abc=125

Answer 2

1000+abc=abc*9

1000=abc*8(cùng bớt abc)

abc=1000/8=125

đ/s:125

Answer 3

1abc = abc x 9

=> 1000 + abc = 9abc

=> 9abc - abc = 1000

=> 8abc = 1000

=> abc = 1000 : 8

=> abc = 125