Toán lớp 4 nhé:

Bạn An có 20 viên bi, bạn Bình thua bạn An 8 viên bi nhưng bạn Hùng ít hơn bạn Bình 2 viên bi .Tìm trung bình cộng số bi của ba bạn

làm chi tiết nhé

tui tick cho

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