如題:
http://i.imgur.com/pKO44i3.jpg
解答:
http://i.imgur.com/0aRVujH.jpg
想問一下圖中方匡中的等式如何變的?
--
Sent from my Android
--
http://i.imgur.com/pKO44i3.jpg
解答:
http://i.imgur.com/0aRVujH.jpg
想問一下圖中方匡中的等式如何變的?
--
Sent from my Android
--
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