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邹老师数学微课：讲解一元二次方程的根（求代数式的值经典例题）
本节课讲解一元二次方程的根后讲一道运用根求代数式的值的题。
一元二次方程合集70/93
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App04:15本节课讲解一元二次方程的根后讲一道运用根求代数式的值的题。
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