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兩組對邊相等的四邊形
判斷球體
球体的体积推导（优化版）
兩位數加法
異分母分數減法
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美麗的剪紙
Parallelogram 01
優良作品3
二次函数y=a(x-h)^2+k各参数性质
正方体内切球
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Addition
Rotation
Quadratic Equations
Dilation
Ratios