1.tim 2 so tu nhien co hieu bang 2002 va tich bang 2006.

2.cho 100 so tu nhien 1,2,3,4,....100.

co the chon duoc 71 so tu nhien sao cho tong cua chung bang tong cua 29 so con lai khong

3.mot so chan co 4 chu so , trong do so tao boi chu so hang tram va hang chuc gap 3 lan chu so hang nghin va gap 2 lan chu so hang don vi .

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Tong cua 2 so la so tu nhien bang 1092 . Neu o so hang thu nhat lan luot thay chu so hang don vi la 9 thanh 3 ,that chu so hang chuc la 7 thanh 1 thi duoc so hang thu hai .Tim hai so do ? ming cac ban giup minh giai bai toan nay nhe va nho co ca loi giai nha cac ban nhe ?

Viet tap hop cac so tu nhien co hai chu so,trong do:

a) Chu so hang chuc nho hon chu so hang don vi la 5

b) Chu so hang chuc gap 4 lan chu so hang don vi

c) Chu so hang chuc nho hon chu so hang don vi, tong hai chu so bang 14

viet tap hop cua cac so tu nhien co 2 chu so trong do

a chu so hang chuc nho hon chu so hang don vi la 5

b chu so hang chuc gap bon lan chu so hang don vi

c chu so hang chuc nho hon chu so hang don vi tong hai so do bang 14

ai giup mk thi se kb nha

mot so tu nhien co 2 chu so trong do chu so hang chuc gap 3 lan chu so hang don vi neu doi chu cac chu so cua no thi duoc so moi nho hon so da cho 36 don vi tim so d acho

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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

viet tap hop cac so tu nhien co hai chu so,trong do:

a,chu so hang don vi lon hon chu so hang chuc 4 don vi

b,chu so hang don vi gap 3 lan chu so hang chuc

c,chu so hang don vi nho hon chu so hang chuc va tong hai chu so =17

 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 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)