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因為三角形EBC是等邊三角形,且正方形ABCD 所以EB=BC,BC=AB,∠EBC=60°,∠ABC=90° 所以EB=AB,∠ABE=30° 所以∠BAE=∠BEA 所以∠BEA =(180°- 30°)/2 = 75°
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