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八上第11章《三角形》P23任意多边形外角和-沿各顶点逐个相加(赵朝东)
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赵朝东
八上第11章《三角形》P23任意多边形外角和-沿各顶点逐个相加(赵朝东)
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中华人民共和国国旗
活动三:应用性质
折扣
异形操场
第三周作业效果演示
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正弦定理验证
triangle
some circles
My GGC-1
第二章 导数定义引例(蜂群增长)
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Geometric Transformations
Symmetry
Parallelogram
Sphere
Arithmetic Operations