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vanstone
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平行线分三角形两边成比例-1
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黄金分割
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比例线段-2
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比例线段-1
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二次函数的y=a(x-h)2+k 图象3
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初三数学-圆中求线段长
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初三数学-几何基本图形再认识
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初三数学-例说线段的最值问题
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初三数学-新函数探究
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初三数学-立体几何
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初三数学-统计与概率
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初三数学-利用函数模型解决问题
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初三数学-数学运算题目剖析
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初三数学-例说一次函数与反比例函数综合题
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初三数学-直线位置关系与推理
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初三数学-例说几何综合题
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初三数学-三角函数的概念与应用
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初三数学-解直角三角形
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初三数学-代数式的概念与运算
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初三数学-巧解选择题
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