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垂直線的斜率
Author:
Anthony OR 柯志明
拖拉紅色 C 點,令兩線垂直。 兩垂直線的斜率有甚麼關係?
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柯志明 香港 GeoGebra 學院
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Ch, 5.2 Ex. 7
Jumlah sudut dalam dan sudut luar segitiga
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