-Chúc bạn học tốt-
`x.(2018 + 1/2018 - 2019 - 1/2019]= 1/3 + 1/6 - 1/2`
`x(2018 + 1/2018 - 2019 - 1/2019) = 2/3 + 1/6 - 3/6`
`x(2018 + 1/2018 - 2019 - 1/2019) = 3/6 - 3/6 `
`x(2018 + 1/2018 - 2019 - 1/2019) = 0`
Mà `2018 + 1/2018 - 2019 - 1/2019` khác `0`
`⇒ x = 0`