a,Tu 1 > 9 co 9 chu so
Tu 10 > 70 co 122 chu so
So N co 9+122=131 chu so
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tim stn co 4cs,cs hang nghin=cs hang don vi, cs hang tram =cs hang chuc va so do viet duoi dang tich cua 3 snt lien tiep
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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1. Tim tat ca cac so co 2 chu so sao cho moi so gap 2 lan tich cua no?
2. Tim so nguyen to co 3 chu so biet rang neu viet so do theo thu tu nguoc lai thi ta duc 1 so la lap phuong cua 1 so tu nhien?
3. Tim so tu nhien co 4 chu so biey chu so hang nghin bang chu so hang don vi chu so hang tram bang chu so hang chuc va so do viet duoc duoi dang tich cua 3 so nguyen to lien tiep?
viet cac so tu nhien lien tiep tu 1 den 100 tu trai sang phai thanh day :
a, day tren co bao nhieu chu so ?
b, chu so thu 1000 ke tu trai sang phai la nhung chu so nao ; la chu so cua so nao
Viet lien tiep cac so tu nhien thanh day 1,2,3,4,5,....hoi chu so 1 o hang don vi cua so 1991 dung hang thu bao nhieu ?
viet bang cah liet ke cac phan tu cua cac tap hop sau:
a) tap hop A cac so tu nhien co 2chu so ma chu so hang chuc lon hon chu so 3
b) tap hop B cac so tu nhien co 2 chu so ma chu so hang don vi gap doi hang chuc
c) tap hop C cac so tu nhien co 2 chu so ma trong so do co it nhat 1 chu so 4
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
viet cac tap hop sau bang cach liet ke phan tu va chi ra moi tap hop co bao nhieu phan tu .
a, tap hop A cac so tu nhien co 2 chu so trong do chu so hang chuc lon hon chu so hang don vi la 2 .
b, tap hop B cac so tu nhien co 3 chu so bang 3 .
- 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)