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数学竞赛题 已知a^4-3a^2+9 是个质数，求质数a 学霸一眼看出本质
数学竞赛题 已知a^4-3a^2+9 是个质数，求质数a 学霸一眼看出本质
因式分解的相关视频29/37
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数学竞赛题 已知a^4-3a^2+9 是个质数，求质数a 学霸一眼看出本质
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