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soaikathanh
2 năm trước
Bạn An viết ra dãy số : 2,9,16,............,2011,2018(dãy A ) Bạn Bắc cũng viết dãy số khác : 3,11,19,............,2011,2019(dãy B) Tìm trung bình cộng của dãy số mà bạn Bắc đã viết . Tính xem xem hai dãy số trên , có bao nhiêu chữ số giống nhau
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