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Business, 24.06.2021 14:00 jessicasbss6840

Một công ti xác định rằng nếu x nghìn USD được chi cho quảng cáo một sản phẩm A, thì sẽ bán được S(x) đơn vị sản phẩm đó, trong đó:
S(x) = (10x + 75)/(x
2
+ 250).
Để bán được lượng sản phẩm lớn nhất, nên tiêu bao nhiêu cho quảng cáo?
A. 9,5 (nghìn USD); B. 10 (nghìn USD);
C. 10,5 (nghìn USD); D. 11 (nghìn USD);

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Một công ti xác định rằng nếu x nghìn USD được chi cho quảng cáo một sản phẩm A, thì sẽ bán được S(...
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