Mình tìm ` x ∈ Z ` nha !
` a) ` ` -4 1/3 (1/2 - 1/6) ≤ x ≤ -2/3 (1/3 - 1/2 - 3/4) ` `(x ∈ Z) `
` <=> -13/3 . 1/3 ≤ x ≤ -2/3 . \frac{-11}{12} `
` <=> -13/9 ≤ x ≤ 11/18 `
` => x ∈ {-1 ; 0} `
` b) ` ` -3 1/4 - 15 3/4 + 150% ≤ x ≤ -5/3 . 12/7 + 5/3 . 2 2/7 ` `(x ∈ Z)`
` <=> -13/4 - 63/4 + 6/4 ≤ x ≤ 5/3 . (-12/7 + 16/7) `
` <=> -35/2 ≤ x ≤ 5/3 . 4/7 `
` <=> -35/2 ≤ x ≤ 20/21 `
` => x ∈ {-12 ; -11 ; -10 ; -9 ; -8 ; -7 ; -6 ; -5 ; -4 ; -3 ; -2 ; - 1 ; 0} `
