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Nhanthanh
2 năm trước
Bài 2: Trung bình cộng của bảy số là 16. Do thêm số thứ 8 nên trung bình cộng của 8 số là 17. Tìm số thứ 8 Các bn giỏi toán giải hộ em bài này vs. em đánh giá 5 sao nha
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