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trumcasio
2 năm trước
Cho HCN ABCD có AB=7cm,AD=4cm.Trên AD lấy 1 điểm sao cho AF=AB.Trên tia AB lấy E sao cho AE=AD,FC cắt BD tại I cắt AB ở N,EC cắt BD ở G và cắt AD ở M a,C/m MD=BN b,C/m Samgin=Sdgc+Sibc c,Tính Samgin
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