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tieuthu_bongbong


Cho tam giac ABC , AB<AC. Tren 2 canh AB va AC lay tuong ung hai diem D va E : sao cho BD=CE . Goi M ,N,I lan luot la trung diem cua BC,DE va CD. Duong thang MN cat AB,AC o P va Q . C/m
a) tam giac MIN can
b) tam giac APQ can
c) MN// voi tia phan giac goc A cua tam giac ABC.
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>- giup minh voi nha , de bai dung day , khi ve hinh duong thang MN cat AB o P thi hay keo dai duong thang MN ra nhe@-)@-)cam on truoc.
a) tam giac MIN can
b) tam giac APQ can
c) MN// voi tia phan giac goc A cua tam giac ABC.