Question

abc2 - 2abc =2142

Answer 1

abc2- 2abc = 2142

abc x 10 + 2 - abc + 2000 = 2142

abc x 10 + 2 - abc = 2142 + 2000

abc x 10 + 2 - abc = 4142

abc x 9 = 4142 - 2

abc x 9 = 4140

abc = 4140 : 9

abc = 460

Vậy abc = 460

Answer 2

2-c=2 => c=0

ab02-2ab0=2142

0-b=4 (nhớ 1) => b=6

a602-2a60=2142

5-a=1 => a=4 

nên abc=460

Answer 3

cảm ơn bạn 2 bạn nhé

Answer 4

\(abc2-2abc=2142\)

\(\Rightarrow abc\cdot10+2-2000-abc=2142\)

\(\Rightarrow abc\cdot10-abc=2142+2000-2\)

\(\Rightarrow abc\cdot9=4140\)

\(\Rightarrow abc=4140:9=460\)

VẬY \(abc=460\)

Answer 5

abc2 - 2abc = 2142

1000a + 100b + 10c + 2 - 2000 - 100a - 10b - c = 2142

900a + 90b + 9c - 1998 = 2142

9( 100a + 10b + c ) = 2142 + 1998

9( 100a + 10b + c ) = 4140

100a + 10b + c = 4140 : 9

100a + 10b + c = 460

<=> abc = 460

 Vậy a = 4

        b = 6

       c = 0