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ukil
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球體建築師
兩位數加法
找出對稱軸
第八周作业
柱體建築師
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立方體拆解第一次
vector addition and subtraction
正立方體
同旁內角---不平行綫
拋物線1-焦點法
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Differential Calculus
Quadratic Functions
Definite Integral
Step Functions
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