Một cái cốc hình trụ có bán kính đáy là 2cm , chiề...
Câu hỏi: Một cái cốc hình trụ có bán kính đáy là 2cm , chiều cao 20cm . Trong cốc đang có một ít nước, khoảng cách giữa đáy cốc và mặt nước là 12cm (Hình vẽ). Một con quạ muốn uống được nước trong cốc thì mặt nước phải cách miệng cốc không quá 6cm . Con quạ thông minh mổ những viên bi đá hình cầu có bán kính 0,6cm thả vào cốc nước để mực nước dâng lên. Để uống được nước thì con quạ cần thả vào cốc ít nhất bao nhiêu viên 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)
A. 29
B. 30
C. 28
D. 27
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG năm 2019 môn Toán lần 1 Trường THPT Ngô Quyền - Hải Phòng