Phân tích thành nhân tử trên tập số phức:  u 4 - v 4

I'm a member of Be a buddy- a programme that helps street childen. Last month, we donated books, clothes,money to the childen in Phu Yen- a flooded area. After the last flood, they are homeless: No home, no food, no water,.. So that why we organization the donate to the childen in the flooded area to help them. That's my volunteer work. Thanks for listening.