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球体的体积推导（优化版）
兩組對邊相等的四邊形
【案例】2018年全国1卷理科12题
兩位數除以一位數（一）
判斷球體
Discover Resources
費氏螺旋線(配合試算表)
ma_test
gjc091a27 三角形旋轉
线段-视觉差
连续开方（制作：谢建华，修订：孟宝兴）
Discover Topics
Statistical Characteristics
Frequency Distribution
Confidence Interval
Polygons
Differential Calculus