如图,在△abc中,d为ac中点,e,f为ab上两点,且ae=bf=1丿4ab,求s△def:s△abc的值如图,在△abc中,d为ac中点,e,f为ab上两点,且ae=bf=4分之1ab,求s△def:s△abc的值
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![如图,在△abc中,d为ac中点,e,f为ab上两点,且ae=bf=1丿4ab,求s△def:s△abc的值如图,在△abc中,d为ac中点,e,f为ab上两点,且ae=bf=4分之1ab,求s△def:s△abc的值](/uploads/image/z/10417385-65-5.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E2%96%B3abc%E4%B8%AD%2Cd%E4%B8%BAac%E4%B8%AD%E7%82%B9%2Ce%2Cf%E4%B8%BAab%E4%B8%8A%E4%B8%A4%E7%82%B9%2C%E4%B8%94ae%3Dbf%3D1%E4%B8%BF4ab%2C%E6%B1%82s%E2%96%B3def%3As%E2%96%B3abc%E7%9A%84%E5%80%BC%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E2%96%B3abc%E4%B8%AD%2Cd%E4%B8%BAac%E4%B8%AD%E7%82%B9%2Ce%2Cf%E4%B8%BAab%E4%B8%8A%E4%B8%A4%E7%82%B9%2C%E4%B8%94ae%3Dbf%3D4%E5%88%86%E4%B9%8B1ab%2C%E6%B1%82s%E2%96%B3def%3As%E2%96%B3abc%E7%9A%84%E5%80%BC)
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