H
huongthao9x


cac ban giai giup minh bai nay.
cho hinh chop SABC co tam giac ABC vuong tai A,SH vg (ABC) va H thuoc AC t/man SH^2 = HA.HC. chung minh:SC vg (SAB).


cho hinh chop SABC co tam giac ABC vuong tai A,SH vg (ABC) va H thuoc AC t/man SH^2 = HA.HC. chung minh:SC vg (SAB).