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minhanh2441999
2 năm trước
tìm một phân số có mẫu số bằng 15, biết rằng nếu trừ đi ở tử số 10 đơn vị và cộng thêm vào mẫu số 10 đơn vị thì ta được phân số mới có giá trị gấp 8/5 lần phân số ban đầu
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