Ban An viet day so 1,0,0,1,0,0,1,0,0,1 ...bat dau la so 1  tiep theo la so hai so 0 roi lại den so 1 hoi

so hang 31 la so 1 hay số 0

khi viet den so hang thu 100 thi ta viet bao nhieu so 1,bao nhieu so 0

cho dãy số:0,1;0,01;0,001

a}so hang thu 1000 co bao nhieu chu so 0?

b}de viet tu so hang thu nhat den so hang thu100 phai dung bao nhieu chu so 1,0

TOI  VIET DAY SO :1,0,0,1,0,0,1,0,0,1. . . (BAT DAU BANG SO 1,TIEP DEN HAI SO 0 ROI LAI DEN SO 1).HOI:

A]SO HANG THU 31 LA SO 1 HAY SO 0?

B}KHI VIET DEN SO HANG THU 100 THI TA VIET BAO NHIEU SO 1, BAO NHIEU SO 0

khi viet tat ca cac so tu nhien tu 1 den 100 thi chu so 0 duoc viet bao nhieu lan

khi viet tat ca so tu nhien tu 1 den 100

a)Chu so 0 duoc viet bao nhieu lan?

b)Chus so 1 duoc viet bao nhieu lan?

c)Cac chu so:2;3;...;9,moi chu so duoc viet bao nhieu lan?

Cho 4 chu so 0 ; 1 ; 2 ; 3 . Hoi tu 4 chu so da cho :

a) Viet duoc tat ca bao nhieu so co 3 chu so khac nhau tu 4 chu so da cho ?

b) Co the viet duoc bao nhieu so co 3 chu so ?

c) Co the viet duoc bao nhieu so le co 3 chu so ma chu so hang chuc la 1 ?

d) Tim so lon nhat, so be nhat co 3 chu so khac nhau viet duoc tu 4 chu so da cho ?

- tim so chu so chan co 4 chu so 

- viet tat ca cac so tu 100 den 999phai dung bao nhieu chuvso 9

-co bao nhieu so le co 3 chu so

- viet 1000 sdo tu nyhien dau tien hoi chu so 3 cco mat bao nhieu lan

-viet tap hop cac so tu nhien co 2 chu so trong do a ) chu so hang chuc nho hon hang don vi la 4 b) chu so hang chuc gap 3 lan chu so hang don vi   c) chu so hang chuc nho hon chu so hang don vi ( tong 2 chu so = 12) 

de viet cac so lien tiep tu 1 den 1000 thi can:

bao nhieu chu so 7

bao nhieu chu so 1

bao nhieu chu so 0

Cho 5 chu so 0 ; 1 ; 2 ; 3 ; 4 hoi tu 5 chu so da cho :

a) Co the viet duoc bao nhieu so co 4 chu so ?

b) Co the viet duoc bao nhieu so chan co 4 chu so ma chu so hang tram la 2 ?