四边形ABCD中,M,N分别是对角线AC,BD上的中点,又AD,BC的延长线交于P,求证:S三角形PMN=1/4 S四边形ABC
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![四边形ABCD中,M,N分别是对角线AC,BD上的中点,又AD,BC的延长线交于P,求证:S三角形PMN=1/4 S四边形ABC](/uploads/image/z/1122875-35-5.jpg?t=%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2CM%2CN%E5%88%86%E5%88%AB%E6%98%AF%E5%AF%B9%E8%A7%92%E7%BA%BFAC%2CBD%E4%B8%8A%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E5%8F%88AD%2CBC%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%A4%E4%BA%8EP%2C%E6%B1%82%E8%AF%81%3AS%E4%B8%89%E8%A7%92%E5%BD%A2PMN%3D1%2F4+S%E5%9B%9B%E8%BE%B9%E5%BD%A2ABC)
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