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Câu 11: Sắp xếp các đa thức theo luỹ thừa giảm dần của biến rồi làm tính chia : (4x2 – 5x + x3 – 20) : (x + 4) Câu 12: Chứng minh rằng với mọi số nguyên a thì (a + 2)2 – (a – 2)2 chia hết cho 4 Câu 13: Biết x + y = 10. Tìm giá trị lớn nhất của P = xy.
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