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Bài 1 (1 điểm). Cho đơn thức a) Thu gọn và tìm bậc của đơn thức A b) Tính giá trị của đơn thức A khi x = - 1 và y = 2 Bài 2 (1 điểm) Tìm nghiệm của các đa thức sau : a) M(x) = 4x – 12 b) N(x) = 2x – x2 Bài 3 (2 điểm) Cho các đa thức : P(x) = 2x3 – x4 + 2x – x2 + x4 + 20 + x ; Q(x) = 2x2 – x3 – 3x – 4 – 3x2 a) Thu gọn và sắp xếp các đa thức trên theo lũy thừa giảm dần của biến. b) Tính T(x) = P(x) + Q(x). c) Tính K(x) = P(x) – Q(x). .cho câu trả lời hay nhất nhé
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