Cho hình nón có chiều cao 2R và bán kính...
Câu hỏi: Cho hình nón có chiều cao 2R và bán kính đường tròn đáy R. Xét hình trụ nội tiếp hình nón sao cho có thể tích khối trụ lớn nhất, khi đó bán kính đáy của khối trụ bằng: 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)
A. \(\frac{{2R}}{3}\)
B. \(\frac{{R}}{3}\)
C. \(\frac{{3R}}{4}\)
D. \(\frac{{R}}{2}\)
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG năm 2019 môn Toán Sở GD & ĐT Hà Nội