Pppppppppppppppppppleaseeeeeeeeeeeeee!!!!!!!
Pppppppppppppppppppleaseeeeeeeeeeeeee!!!!!!!
Cho A va B la 2 STN
Biết A = \(2^0+2^1+2^2+2^3+...+2^{2009}\)
B = \(2^{2010}\)
Chứng to rang A va B la 2 so tu nhien.
cho STN n. chung to rang 3n+2 va 5n+3 la hai so nguyen to cung nhau
tim so tu nhien co 2 chu so biet rang so do hon 7 lan tong cac chu so cua no la 6 don vi
tinh tong
a, S = 2 + 4 + 6 + .......... + 100
b, Tim so phan tu cua mot tap hop cac so tu nhien co 3 chu so va tinh tong tim duoc
tim mot so tu nhien a biet 1960 va 2002 chia cho aco cung so du la 28
ai nhanh tick
tim so tu nhien co 3 chu so biet rang neu tang moi chu so cua no len n don vi thi ta duoc mot so co 3 chu so gap n lan so da cho
tim so tu nhien co 4 chu so biet rang so nay chia 3 du 2, cac chu so hang ngan,hang chuc, hang tram, hang don vi lan luot la la cac so tu nhien lien tiep tang dan va trong 4 chu so do khong co chu so nao bang 7
Tim so co 2 chu so,biet rang nếu lay so do chia cho hieu cua chu so hang chuc va chu so hang don vi ta co thuong la 26 du 1
tim 2 so tu nhien co tong = 432 , ƯCLN cua chung = 36
tim 2 so tu nhien co tong = 66 , ƯCLN = 6 . mot so chia het cho 5
tim 2 so tu nhien co hieu = 84 biet ƯCLN = 12
tim 2 so tu nhien co tich = 864 , ƯCLN = 6