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test for 2nd view
Author:
羅驥韡 (Pegasus Roe)
test for 2nd view
GeoGebra
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中華民國國旗 (Codex╱2026.10.06)
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[問題] a² + b² = 1, (c-4)² + (d-2)² = 5，求 ad - bc 最大值？
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