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軌跡方程式
Author:
Ho-Kai Chen
動圓和定圓C外切, 因兩圓相切, 切點隨著動圓而變動... 動圓的圓心軌跡是拋物線
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Addition of Vectors Algeraically
Dividing a 2-digit number by a 1-digit number (2)
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