Question

[dohuong]

15 + 2.(x -1) = 17

27 - (x -3 ) = 3² .3

Answer 1

[Đinh Tuấn Việt]

a) => 2.(x-1) = 17 - 15 = 2

=> x - 1 = 2 : 2 = 1

=> x = 1 + 1 = 2

b) => 3³ - (x - 3) = 3³

=> x - 3 = 3³ - 3³

=> x - 3 = 1

=> x = 1 + 3

=> x = 4