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2 năm trước
Người ta làm một cái hộp bằng bìa cứng dạng hình lập phương không nắp có cạnh 3,5dm . Tính diện tích bìa để làm cái hộp đó? ( Phần mép dán không đáng kể)
Thích Trả lời Chia sẻ

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