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三角形ABC應該是全等於三角形DEF吧,那麼AB=DE=2 AC=DF=4 由三角形三邊關係 EF的邊長範圍在4-2=2到4+2=6之間 又因為DE+DF+EF為偶數 所以EF是4 希望對你有所幫助哦
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