1: cho phân số 3/4 nếu cộng thêm 12 vào tử số thì cần phải cộng thêm bao nhiêu vào mẫu số để được phân số mới = 3/4 2: trong một phép chia hai số tự nhiên= 4 số dư là 25 và tổng số chia và số dư là 515. Hỏi số chia của phép là bao nhiêu

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