[dse 數學] 二次方程 — 二根之和及積（系數比較法）
Synopsis
嗚謝達權老師。 對抗惡意負評， 支持我， 記得留言比like。 ============== 全新井頻道的網站上線啦! 今面整理好所有片段，方便 ...
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