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myhanhlogavn
2 năm trước
Cho các đa thức: A(x) = – 4x2 – 2x – 8 + 5x3 – 7x2 +1; B(x) = –3x3 + 4x2 + 9 + x – 2x – 2x3. a) Thu gọn và sắp xếp các đa thức trên theo lũy thừa giảm dần của biến. b) Tính M(x) = A(x) + B(x), N(x) = A(x) – B(x). c) Chứng tỏ x = 2 là nghiệm của đa thức M(x) nhưng không phải là nghiệm của đa thức N(x). d) Tìm các nghiệm của đa thức M(x)
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