Tìm x ∈ Z sao cho: (x - 2).(2x – 1) = 0

Câu 2: Tìm x ∈ Z sao cho:

a. (x - 2).(2x – 1) = 0

b. (x2 + 1).(81 - x2) = 0

c. (x - 5)5 = 32

d. (31 - 2x)3 = -27

e. (x – 2).(7 – x) > 0