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初中数学：第三轮传染后，有2662人患了流感，求最开始患病人数？
初中数学：第三轮传染后，有2662人患了流感，求最开始患病人数？
初中数学，解一元二次方程，根的判别式，韦达定理，中考培优真题49/168
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