T
tieuthu_bongbong


cho tam giac ABC vuong can o A , ve ra phia ngoai cua 2 tam giac deu ABD va ACE
a) C/m BE = CD
b) BE giao voi CD tai I . Tinh goc BIC
a) C/m BE = CD
b) BE giao voi CD tai I . Tinh goc BIC