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Vnhminh1208
2 năm trước
Chứng minh rằng a. ( x+y trên 2 )^2 lớn hơn hoặc bằng xy b. x^2+ y^2 lớn hơn hoặc bằng ( x+y trên 2)^2 c. x^2 + y^2 lớn hơn hoặc bằng ( x+y)^2 trên 2
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