濡傚浘,鍦ㄢ柍ABC涓?AB=AC,鈭燘AC=40掳,B涓虹洿寰勭殑鍦嗕氦BC浜嶥,C浜嶦,姹傚姬BD,E,A鐨勫害鏁?椤轰究闂?竴涓?寮х殑搴︽暟鏄?粈涔堟剰鎬?

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濡傚浘,鍦ㄢ柍ABC涓?AB=AC,鈭燘AC=40掳,B涓虹洿寰勭殑鍦嗕氦BC浜嶥,C浜嶦,姹傚姬BD,E,A鐨勫害鏁?椤轰究闂?竴涓?寮х殑搴︽暟鏄?粈涔堟剰鎬?
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濡傚浘,鍦ㄢ柍ABC涓?AB=AC,鈭燘AC=40掳,B涓虹洿寰勭殑鍦嗕氦BC浜嶥,C浜嶦,姹傚姬BD,E,A鐨勫害鏁?椤轰究闂?竴涓?寮х殑搴︽暟鏄?粈涔堟剰鎬?
濡傚浘,鍦ㄢ柍ABC涓?AB=AC,鈭燘AC=40掳,B涓虹洿寰勭殑鍦嗕氦BC浜嶥,C浜嶦,姹傚姬BD,E,A鐨勫害鏁?

椤轰究闂?竴涓?寮х殑搴︽暟鏄?粈涔堟剰鎬?

濡傚浘,鍦ㄢ柍ABC涓?AB=AC,鈭燘AC=40掳,B涓虹洿寰勭殑鍦嗕氦BC浜嶥,C浜嶦,姹傚姬BD,E,A鐨勫害鏁?椤轰究闂?竴涓?寮х殑搴︽暟鏄?粈涔堟剰鎬?
∵AB=AC,∠BAC=40°