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∠A=180°-∠B-∠C=75° AD=BD=根號3CD ∵(1+根號3/3)BD=a=12cm ∴BD=AD=18-6根號3 ;cm ∴AB=根號2BD=18根號2-6根號6 ; ;cm, AC=2/根號3×AD=12根號3-12 ; ;cm
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