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nykhoa11
2 năm trước
Cho PS $\frac{x}{y}$. Rút gọn PS $\frac{x}{y}$ thì được PS $\frac{5}{7}$ . Nếu thêm 71 vào tử số và giữ nguyên mẫu số thì ta được $\frac{18}{11}$. Tìm PS $\frac{x}{y}$ đã cho
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