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一元二次方程根的判别式 -2
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一元二次方程根的判别式 -1
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一元二次方程的解法(3)
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一元二次方程的解法(2)
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三角形中位线定理 探究与应用
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特殊平行四边形的性质与判定
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函数
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平方根
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一元二次方程的解法
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一元二次方程的解法
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平行四边形的判定
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一元二次方程的解法(9)
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全等三角形复习
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四边形
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直角三角形
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一次函数的性质
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用计算器计算标准差和方差(2)
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一元二次方程的解法
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一元二次方程的解法(1)
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等腰三角形的性质
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