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từ trang 1- >9 có 9 chữ số
từ trang 10->78 có:[(78-10):1+1]x2=136
Vậy cần có 136+9=145 số
HT



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K MK NHA
ko phải toán lớp 3 đâu bạn
ko phải toán lớp 3 đâu mà gửi