Tim hai so co tong la 107 . Biet rang neu xoa di chu so 8 o hang don vi cua so lon ta duoc so be.
tim 2 so biet rang so lon la so co 4 chu so neu xoa di chu so 5 thuoc hang nghin cua so lon thi duoc so be = 1/9 so lon
tong hai so la so lon nhat co hai chu so tim hieu hai so do biet neu xoa chu so 0 o ben phai so lon ta duoc so be
Tim 2 so co tong = 352 biet rang neu them chu so 0 vao ben phai so be thi duoc so lon
tim hai so co hieu 385 biet rang neu xoa di chu so 7 o hang don vi cua so lon thi duoc so be
tim 2 so co hieu bang 593 , biet rang neu xoa chu so cuoi cung cua so lon thi duoc so be .
tong 2 so la 499 neu xoa chu so 4 o so lon thi duoc so be tim so be
1. Tim 2 so co tong = 129. Neu lay so thu 1 chia cho so thu 2 thi duoc thuong la 6 du 3.
2. Tim 2 so co hieu = 114. Neu xoa chu so o hang don vi cua so lon thi duoc so be
tim hai so tu nhien biet tong cua chung = 257 va neu xoa chu so 0 o tan cung cua so lon thi ta duoc so be ?
