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chutoan
2 năm trước
Một khu đất hình chữ nhật có diện tích 486m và chiều dài gấp 6 lần chiều rộng. Hỏi cần bao nhiêu viên gạch để xây tường bao xung quanh khu đất đó? Biết rằng bức tường cao 2m, mỗi mét vuông tường cần 65 viên gạch và ở một phía người ta đề lôi ra vào rộng 3 m. làm giúp em bài này vs
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