T
thienthanxanh_501


cho hinh chop S.ABCD co day la hinh binh hanh tam O. goi M la trung diem cua SB, G la trong tam tam giac SAD.
a/tim giao diem I cua GM voi (ABCD)
chung minh I o tren duong thang CD va IC=2ID
b/tim giao diem J cua (OGM) voi AD.Tinh JA/JD
c/tim giao diem K cua (OGM) voi SA.tinh KA/KS
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MEM OF BIGZERO GROUP
a/tim giao diem I cua GM voi (ABCD)
chung minh I o tren duong thang CD va IC=2ID
b/tim giao diem J cua (OGM) voi AD.Tinh JA/JD
c/tim giao diem K cua (OGM) voi SA.tinh KA/KS
___________________________________________________________________________