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nguyentrang081998
2 năm trước
Một thùng ko nắp đang hình hỗ chữ nhật làm bằng tôn ,ko có nắp có CD :1,2m ,CR: 0,8m ,h : 5dm .Người ta quét sơn tắt cả mà ngoài và mà trong của thùng .Tính S để quét sơn (đó đây to ko đang kể)
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