Cho 1 so co 2 chu so. Biet rang so do gap 7 la chu so hang don vi neu chia so do cho chu so hang chuc cua no duoc thuong la 11 du 2. Tim so da cho.
TIm so lon nhat, nho nhat co 9 chu so biet so do chia 5,7,9,11 co so du lan luot la 3,4,5,6
hieu cua hai so bang 20 thuong cua hai so bang 2,25 tinh moi so
tim so du cua phep chia 19n^n +5n^2+1890n+2016 chia cho (n-1)^2
tim so du cua phep chia 19n^n +5n^2+1890n+2016 chia cho (n-1)^2
bac tu co hai nguoi con nguoi con thu nhat gap 2 lan tuoi nguoi con thu hai tuoi bac tu gap 2 lan tong so tuoi cua hai nguoi con.Hoi bac tu bao nhieu tuoi
tim hai so tu nhien hon kem nhau 12 don vi biet tich cua chung bang 20 lan so lon cong voi 6 lan so be
tim mot so co 2 chu so. biet chu so hang chuc>chu so hang don vi la 2 neu lay so do chia tong chu so cua no dc 6 du 1
a) Tim so du cua phep chia: 2011109 + 201267 + 6789123456789 cho 57.
b) Tim ba chu so tan cung cua 2009200920092009 + 2011201120112011 -2013
