Câu 7: Một bể bơi dạng hình hộp chữ nhật có chiều dài 1,3 m, chiều rộng 0,9 m và chiều cao 16 m. Hiện mức nước trong bể cao 10 m. Người ta đổ vào bể một xe đá và mức nước dâng 15 m. Tính thể tích đá được đổ vào bể.

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