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9 年级 NCERT 数学课本
9 年级 NCERT 数学课本
第 1 章 - 数系
第 2 章 - 多项式
第 3 章 - 坐标几何
第 4 章 - 二元一次方程
第 5 章 - 欧几里德几何简介
第 6 章 - 直线和角
第 7 章 - 三角形
第 8 章 - 四边形
第 9 章 - 平行四边形和三角形的面积
第 10 章 - 圆
第 11 章 - 绘图
第 12 章 - 希罗公式
第 13 章 - 表面积和体积
第 14 章 - 统计
第 15 章 - 概率

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第 6 章 - 直线和角

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