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[学用] 螺线线与圣诞树
Author:
acchu
GeoGebra
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球體建築師
【案例】2013年安徽高考15题
球体的体积推导（优化版）
第八周作业
異分母分數減法
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number line
HW1121505
动圆在定圆上滚动
S4 math
梯形
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Rational Numbers
General Quadrilateral
Derivative
Congruence
Vectors