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(1) a²;+b²;=c²; a²;+4²;=7²; a=√33 (2) 設a為3k則c為5k a²;+b²;=c²; (3k)²;+16²;=(5k)²; 16k²;=16²; k=4 a=3*4=12 c=5*4=20
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