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NCERT 9 年級數學教材
NCERT 9 年級數學教材
第 1 章 - 數系
第 2 章 - 多項式
第 3 章 - 座標幾何
第 4 章 - 二元一次方程
第 5 章 - 歐幾里得幾何學入門
第 6 章 - 直線與角
第 7 章 - 三角形
第 8 章 - 四邊形
第 9 章 - 平行四邊形和三角形的面積
第 10 章 - 圓
第 11 章 - 作圖
第 12 章 - 海倫公式
第 13 章 - 表面積和體積
第 14 章 - 統計
第 15 章 - 機率

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第 3 章 - 座標幾何

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