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viet so tu nhien N =12345678910111213141516...70 ,
a)so N co bn chu so
,b) cs hang don vi cua so 53 dung hang thu may (ke tu trai sang phai moi cs 1 hang),
c) cs viet o hang thu 120 la cs nao?cs do cua so tn nao
cho day 2,11,29,56,92,.. a) tim so hang thu 100 cua day b)so 407 la so hang thu may cua day
Bon so tu nhien lien tiep theo thu tu tang dan la cac chu so hang nghin , hang tram , hang chuc , hang don vi . cua mot so co 4 chu so. Viet cac chu so cua no theo thu tu nguoc lai ta se duoc mot so moi co bon chu so lon hon so ban dau ......don vi
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cho day 2,11,29,56,92,..
a) tim so hang thu 100 cua day
b)so 407 la so hang thu may cua day
b3v: so hoc sinh khoi 6 cua truong la mot so tu nhien co ba chua so. moi hang xep 18 , hANG xep 21, hang 24 deu vua du hang ,tim so hoc sinh khoi 6 cua truong do
giup minh voi may tinh minh con 5 % pin a
Cho day so chan lien tiep tu 2,4,6,8,... . Hoi so 1996 la so hang thu bao nhieu cua day
tim 1 stn co 6 chu so hang don vi la 4. neu ta doi chu so 4 len dau(thanh chu so hang van), cac chu so khac van giu nguyen thu tu thi dc so moi gap 4 lan so cu
tim so tu nhien co so nghin la 20 chu so hang truc la 5 va chu so hang don vi la 2
Q la tap hop so tu nhien co 2 chu so ma trong moi so chu so hang chuc lon hon chu so hang don vi la 2 . tinh so phan tu cua tap hop Q