Question

Tìm abc ​biết 5abc - abc5=1215

Answer 1

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

Answer 2

ggggggggggggggggggggg

Answer 3

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

k mk nha bn

Answer 4

5000 + abc - 10 x abc - 5 = 1215

5000 + 5 - 1215 = 10 x abc - abc

3780 = 9 x abc

abc = 3780 : 9 = 420