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tranghuong79
2 năm trước
hai tổ làm chung một công việc sau 12h xong việc. nếu 2 tổ làm chung trong 3h, sau đó tổ 2 đi làm việc khác và tổ 1 làm thêm 7h thì được 7 phần 12 công việc. hỏi mỗi tổ làm một mình thì bao lâu xong công việc?
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