Cho một tấm nhôm hình chữ nhật ABCD có AD = 90cm....
Câu hỏi: Cho một tấm nhôm hình chữ nhật ABCD có AD = 90cm. Ta gập tấm nhôm theo hai cạnh MN và PQ vào phía trong đến khi AB và DC trùng nhau như hình vẽ sau đây để được một hình lăng trụ khuyết hai đáy. Giá trị của x để thể tích khối lăng trụ lớn nhất là![](data:image/png;base64,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)
A. x = 30 cm
B. x = 22,5 cm
C. x = 25 cm
D. x = 20 cm
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG năm 2019 môn Toán Trường THPT Hoàng Văn Thụ