Question

abc2 - 2abc = 2142

Answer 1

abc2 - 2abc = 2142

 = > 2abc + 2214 = abc2

2000 + abc + 2214 = abc x 10 + 2

4212 + 2 + abc  = abc x (9 + 1) + 2

4212 + 2 + abc  = abc x 9 + abc + 2

4212 = abc x 9 

abc = 486

Answer 2

460 trong violympic đúng đấy

Answer 3

abc=460