5abc - abc5 = 1215

5000 + abc - ( abc x 10 - 5 ) = 1215

5000 - 5 - abc x 9 = 1215

4995 - 1215 = abc x 9

3780 = abc x 9

       abc = 3780 : 9

       abc = 420

a=4,b=2,c=0 bn ak.

đúng thì k cho mik nha

ta có: 

\(abc5-1107=5abc\)

\(1107=abc5-5abc\)

\(\Rightarrow abc5-5abc=1107\)

\(\Rightarrow abc\cdot10+5-5000-abc=1107\)

\(abc\cdot10-abc=1107+5000-5\)

\(abc\cdot9=6102\)

\(abc=6102:9=678\)

VẬY \(abc=678\)

TK MK NHA. ^_^

678 nha kb nha

Ta có : 15 - 7 = c .Vậy c = 8 

ab85 - 1107 = 5ab8

8 - 1 ( nhớ hàng đơn vị ) = b . Vậy b = 7  

a785 - 1107 = 5a78

a - 1 = 5 . Vậy a = 6 

Vậy abc = 678

\(\overline{abc5}\) - 1107 = \(\overline{5abc}\)

\(\overline{abc}\) x 10 + 5 - 1107 = 5000 + \(\overline{abc}\)

\(\overline{abc}\) x 10 - \(\overline{abc}\) = 5000 + 1107 - 5

\(\overline{abc}\) x (10 - 1) = 6107 - 5

\(\overline{abc}\) x 9 = 6102

\(\overline{abc}\) = 6102 : 9

\(\overline{abc}\) = 6102 : 9

\(\overline{abc}\) = 678

Đáp số: \(\overline{abc}\) = 678

abc=746

5abc = 10abc + 5 - 1719

10abc - 5abc = 1719 - 5

5abc = 1714

abc = 1714 : 5 = bạn tự tính nha

5abc - abc5 = 1215

5000 + abc - ( abc x 10 - 5 ) = 1215 

5000 - 5 - abc x 9 = 1215

4995 - abc x 9 = 1215

abc x 9 = 4995 - 1215

abc x 9 = 3780

          abc = 3780 : 9

          abc 420

ggggggggggggggggggggg

\(\overline{abc5}\) - \(\overline{5abc}\) = 3519

\(\overline{abc}\) x 10 + 5 - 5000 - \(\overline{abc}\) = 3519

\(\overline{abc}\) x (10 - 1) + 5 = 3519 + 5000

\(\overline{abc}\) x 9 + 5 = 8519

\(\overline{abc}\) x 9 = 8519 - 5

\(\overline{abc}\) x 9 = 8514

\(\overline{abc}\) = 8514 : 9

\(\overline{abc}\) = 946

Đáp số: \(\overline{abc}\) = 946

Câu b:

\(\overline{abc1}\) - 3105 = \(\overline{1abc}\)

\(\overline{abc}\) x 10 + 1 - 3105 = 1000 + \(\overline{abc}\)

\(\overline{abc}\) x 10 - \(\overline{abc}\) + 1 = 1000 + 3105

\(\overline{abc}\) x (10 - 1)+ 1 = 4105

\(\overline{abc}\) x 9 = 4105 - 1

\(\overline{abc}\) x 9 = 4104

\(\overline{abc}\) = 4104 : 9

\(\overline{abc}\) = 456

5abc - abc5 = 3555

=> 5000 + abc - abc x 10 - 5 = 3555

=> 4995 + abc - abc x 10 = 3555

=> 4995 - 3555 = abc x 10 - abc 

=> 1440 = 9 x abc

=> abc = 160 

  5abc-abc5=3555

=5765-2210=3555

CHÚC BẠN HỌC TỐT!

= 946

kick mình nha

= 946

t mink nha

5000-5+3519:9=946

Đs 946

\(\overline{abc5}\) - \(\overline{5abc}\) = 3519

\(\overline{abc}\) x 10 + 5 - 5000 - \(\overline{abc}\) = 3519

\(\overline{abc}\) x (10 - 1) + 5 = 3519 + 5000

\(\overline{abc}\) x 9 + 5 = 8519

\(\overline{abc}\) x 9 = 8519 - 5

\(\overline{abc}\) x 9 = 8514

\(\overline{abc}\) = 8514 : 9

\(\overline{abc}\) = 946

Đáp số: \(\overline{abc}\) = 946