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Bài 1: Tìm x ∈ Z: a. -3 : (x – 2) là một số nguyên b. (x + 8) \displaystyle \vdots (x + 7) c. (2x – 9) \displaystyle \vdots (x – 5) d. (5x + 2) \displaystyle \vdots (x + 1) e. (2x + 16) \displaystyle \vdots (x + 8) f. 3x \displaystyle \vdots (x + 2) Bài 2: Tính tổng các số nguyên x: a. x chẵn và 6 ≤ x ≤ 202 b. x lẻ và 7 < x < 2017 c. 12 x 2017 và x \displaystyle \vdots 5 Mấy bạn giỏi làm nhanh, đúng bước hộ mình nhé gấp lắm roii.
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