Câu 1. Chọn câu trả lời đúng: Với a, b, c mà c > 0, ta có: Nếu a < b thì. A. ab > bc B. ac < bc C. ac = bc D. ac > bc Câu 2. Chọn câu trả lời đúng: Với a, b, c mà c < 0, ta có: Nếu a > b thì. A. ab > bc B. ac = bc C. ac < bc D. ab > ac Câu 3. Chọn câu trả lời đúng: A. (-2019).21 < (-2020).21 B. (-2019).39 < (-2020). 51 \ C. (-2019). ( -36) > 198. (-2020) D. (-2019). ( -2020) < 2021. (- 2020) Câu 4. Chọn câu trả lời đúng: Cho -29x > -21x, ta có: A. x > 0 B. x < 0 C. x = 0 D. x lớn hơn hoặc bằng 0 Câu 5. Chọn câu trả lời đúng: Cho tam giác ABC có số đo các góc A, B , C lần lượt là x, y , z (tính bằng độ) thì: A. x + y + z < 1800 B. x + y + z > 1800 C. x + z > 1800 D. x + y < 1800 Câu 6. Chọn câu trả lời đúng: Cho -24a + 113 < -24b + 113 ta chứng tỏ được: A. a > b B. a = b C. a < b D. a nhỏ hơn hoặc bằng b

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