So sanh: a) 291 va 535
b) 15/59 va 24/97
c) (1/243)9 va (1/83)13
Bai 2: Tren bang viet 99 so: 1,2,3,4,...,99. Cu moi lan nguoi ta xoa di 2 so bat ki roi lain viet gia tri cua tong 2 so vua xoa vao bang. Cuoi cung tren bang chi con lai 1 so, gia su so do la so k. Hay tim k va chung to k khong phai la so chinh phuong.
Cac ban giup minh voi.MIinh dang can rat gap. Thank you my friends!