Câu 1: Cho 2 p/s có tổng bằng 5 lần tích của chúng. Tính tổng các nghịch đảo của 2 p/s đó. Câu 2: Cho a,m,n ∈ N* , hãy so sánh hai tổng sau: A = 10/ a ³ + 10/a ² và B = 11/a ³ +9/a ²

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