Question

7ab = 2. ab7 + 21

Answer 1

7ab = 2.ab7 + 21

700 + 10a + b = 2.( 100a + 10b + 7) + 21

700 + 10a + b = 200a + 20b + 14 + 21

700 + 10a + b = 200a + 20b + 35

200a + 20b + 35 - 10a - b = 700

190a + 19b + 35 = 700

190a + 19b = 700 - 35

190a + 19b = 665

19.( 10a + b ) = 665

10a + b  = 665 : 19

10a + b =35

\(\Rightarrow\)a = 3, b = 5

Answer 2

\(7ab=2.ab7+21\)

\(\Leftrightarrow=2+21\)

       \(=23\)

[ Chúc may mắn ]