một hình lập phương có dt toàn phần là 864cm2 . Tính thể tích hình lập phương đó . một bể bể cá dạng hình hộp chữ nhật làm bằng kính ( o có nắp ) có chiều dài 80cm , chiều rộng 50cm , chiều cao 45cm . a) tính dt kính dùng để làm bể cá đó . b) Mực nước trong bể cao 35cm . Hỏi thể tích nước có trong bể là bao nhiêu lít ?

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