Question

Tìm số abc thỏa mãn abc0-abc=1215

Answer 1

=> abc x 10 - abc = 1215

=> abc x 9 = 1215

=> abc = 1215 : 9

=> abc = 135

Answer 2

=> abc x 10 - abc = 1215

=> abc x 9 = 1215

=> abc = 1215 : 9

=> abc = 135

Answer 3

\(abc0-abc=1215\)

\(\Rightarrow abc\times10-abc=1215\)

\(\Rightarrow abc\times\left(10-1\right)=1215\)

\(\Rightarrow abc\times9=1215\)

\(\Rightarrow x=1215\div9\)

\(\Rightarrow x=135\)