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BE=10. 理由: 等邊三角形中,AD=AB,AC=AE,∠DAB=∠CAE=60°. 則∠DAB+∠BAC=∠CAE+∠BAC,即∠DAC=∠BAE. 則△DAC≌△BAE(邊角邊) 則BE=DC=10.
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