|x-1|=2x-1 toán 8

Question

|x-1|=2x-1

Answer 1

|x-1|=2x-2

TH1 : x ≥ 1

x - 1 = 2x - 2

⇔    -x = -1

⇔    x  = 1 (TM)

TH2 : x < 1

x - 1 = -2x + 2

⇔ 3x= 3

⇔ x  = 1 (KTM)