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Toán 12: Bác thợ hàn dùng một thanh kim loại dài 4m để uốn thành khung cửa sổ có
11 days ago
45
Bác thợ hàn dùng một thanh kim loại dài 4m để uốn thành khung cửa sổ có dạng như hình vẽ. Gọi r là bán kính của nửa đường tròn. Giá trị r (theo mét) để diện tích tạo thành đạt giá trị lớn nhất có dạng a/(π+b). Khi đó a+b bằng:
#DienTich
#Derivative
#DaoHam
#Calculus
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