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平行四邊形之變奏I
Author:
周桂名
拉動一下C、D兩點，觀察一下！
[四邊形ABCD會怎麼變？] [G、E、F應該是特別的點吧！]
Discover Resources
Step 6
Cross Sections
C1 Graffiau CBAC Haf 2009
Start, Copy Segment
Derivative of X^2 at 2
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