tui 0 chep lai de, cung 0 nho chinh xac. Chi nho da.ng de thoi, noi so so cho u nghe. Fan bat buoc kha' kho'. Co' 1 cau chung minh quy na.p (chung minh 1 day so chia het cho 16). 1 cau du`ng da.ng (a + b) mu~ n, sau do ap dung de ti'nh gan du'ng. (co`n lai thi` tui quen rui`). Fan tu chon de hon. 1 cau hi`nh khong gian. 1 cau ve complex number & luong giac (day la` cau de nhat). 1 cau ve tich phan (tich the tich) & vi phan. Hi vong u vua y'. Luxuguy
