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向量證明最簡單了AD→=AB→+BC→+CD→∴AD→-BC→=AB→+CD→∴(AD→-BC→)²;=(AB→+CD→)²;AD²;+BC²;-2AD→*BC→=AB²;+CD²;-2AB→*CD→∵AD→⊥BC→,AB→⊥CD→∴AD→*BC→=AB→*CD→= 0∴AD…
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