Một thùng tôn dạng hình hộp chữ nhật ( không có nắp ) có chiều dài 1,5 mét, chiều rộng 0,6 mét, chiều cao 50 cm.Tính:

- Diện tích tôn để làm thùng đó ( không tính mép hàn ).

- Thể tích thùng tôn trên.

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