Help Me```初3.四边形ABCD（其实是平行四边形）中,M是BC中点,BD交AM于点P,求证：PD：BP=2：1

来源：学生作业学帮网 编辑：学帮网 时间：2024/06/01 16:09:34

Help Me```初3.
四边形ABCD（其实是平行四边形）中,M是BC中点,BD交AM于点P,求证：PD：BP=2：1

连接AC交BD于O.在三角形ABC中AM与BO的交点是三角形的重心.所以BP：PO=2：1.所以BP=2/3OB=1/3DB.所以PD：BP=2：1

Help Me```初3.四边形ABCD（其实是平行四边形）中,M是BC中点,BD交AM于点P,求证：PD：BP=2：1 如图,在四边形ABCD中,AB>CD.E,F分别是对角线BD、AC的中点,求证：2分之1（AB+CD）＞EF.help me help help help me help!help!help me help me help me help me!help me! help me,help me help me help me help me!help me! help me,help me help me help me Help me Help me Help me! help me! help me help me! Help me help me help me help me! help me! help me