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延長AN交BC延長線P ME//AN,M為AB中點,ME為三角形ABP中位線 所以:ME=1/2AP AD//BC,N為CD中點 所以:N為AP中點,AN=AP/2 所以:AN=ME,又ME//AN 所以:AMEN為平行四邊形 所以:AM=NE
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