急 4道初二几何题1.△ABC中,AB=5,AC=7,AD是中线,求AD的范围(这道没图 其他3道都有图)2.AD是△ABC的中线,AF=EF,求证BE=AC3.OA=OB,OC=OD,∠O=50°,∠D=35°,求∠AEC4.AB=AC,DE=EF,求证BD=CF这是新图
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![急 4道初二几何题1.△ABC中,AB=5,AC=7,AD是中线,求AD的范围(这道没图 其他3道都有图)2.AD是△ABC的中线,AF=EF,求证BE=AC3.OA=OB,OC=OD,∠O=50°,∠D=35°,求∠AEC4.AB=AC,DE=EF,求证BD=CF这是新图](/uploads/image/z/10754136-0-6.jpg?t=%E6%80%A5+4%E9%81%93%E5%88%9D%E4%BA%8C%E5%87%A0%E4%BD%95%E9%A2%981.%E2%96%B3ABC%E4%B8%AD%2CAB%3D5%2CAC%3D7%2CAD%E6%98%AF%E4%B8%AD%E7%BA%BF%2C%E6%B1%82AD%E7%9A%84%E8%8C%83%E5%9B%B4%EF%BC%88%E8%BF%99%E9%81%93%E6%B2%A1%E5%9B%BE+%E5%85%B6%E4%BB%963%E9%81%93%E9%83%BD%E6%9C%89%E5%9B%BE%EF%BC%892.AD%E6%98%AF%E2%96%B3ABC%E7%9A%84%E4%B8%AD%E7%BA%BF%2CAF%3DEF%2C%E6%B1%82%E8%AF%81BE%3DAC3.OA%3DOB%2COC%3DOD%2C%E2%88%A0O%3D50%C2%B0%2C%E2%88%A0D%3D35%C2%B0%2C%E6%B1%82%E2%88%A0AEC4.AB%3DAC%2CDE%3DEF%2C%E6%B1%82%E8%AF%81BD%3DCF%E8%BF%99%E6%98%AF%E6%96%B0%E5%9B%BE)
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