cho tam giac ABC vuong tai A . PHAN GIAC TRONG CUA GOC B CAT CANH D TU D KE DE VONG GOC VOI BC TIA EDva tia BA?

TREN KHONG DU MINH VIET TIEP DE BAI NHA : CAT NHAU TAI DINH E.

a. so sanh da va dc.

b. chung minh BD vong goc voi FC , AE// FC

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