Từ một tấm bìa cứng hình vuông cạnh a, người ta cắ...
Câu hỏi: Từ một tấm bìa cứng hình vuông cạnh a, người ta cắt bốn góc bốn hình vuông bằng nhau rồi gấp lại tạo thành một hình hộp không nắp. Tìm cạnh của hình vuông bị cắt để thể tích hình hộp lớn nhất.![](data:image/png;base64,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)
A. \(\frac{a}{2}\)
B. \(\frac{a}{8}\)
C. \(\frac{a}{3}\)
D. \(\frac{a}{6}\)
Câu hỏi trên thuộc đề trắc nghiệm
30 bài trắc nghiệm toán thực tế ôn thi THPT QG năm 2018 môn Toán