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[問題] a² + b² = 1, (c-4)² + (d-2)² = 5,求 ad - bc 最大值?
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
提示:
ad - bc 可看成 (a, b) 與 (d, -c) 的內積。
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