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初中数学（9）上：一元二次方程经典解法——看看你是否早已忘记
一元二次方程的经典解法，用十字相乘法分解因式后求解。
一元二次方程合集71/93
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App04:15一元二次方程的经典解法，用十字相乘法分解因式后求解。
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