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因為AB‖DF 所以∠B=∠F 又因為∠A=∠D,BC=EF 由三角形相等定理裡面一條,2角一邊可知 三角形abc相等於三角形def 所以AC=DE 具體是定理裡面的幾我不記得了,是在是太多年了.什麼符號的你自己改.
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