Write your diary or blog for this week.

*Writing Plan*
1. Say if it was a good or bad week.
2. Say what else happened.
3. Say what you can't wait to do soon.
4. Remember to use time expressions.

P.s. Giúp vs ạ!!! :((

Cho \(\Delta\)ABC điểm O nằm trong \(\Delta\) sao cho \(\widehat{ABO}=\widehat{ACO}\). Gọi H, K là hình chiếu của O trên AB, AC.

a) Gọi E, F là trung điểm OB, OC. CMR:\(\widehat{OEH}=\widehat{OFK}\).

b) CMR: MH=MK.