viet so lon nhat co bon chu so ma tong cac chu so bang 9 ,hieu chu  so hang don vi  va hang don  vi va hang nghin la 5

viet so lot nhat co bon chu soma tong cac chu so bang 9,hieu chu so hang don vi va hang nghin la 5

tim tat cac so tu nhien co ba chu so thoan man cac tinh chat sau : co tong cac chu so bang 9 chu so hang chuc lom hon chu so hang don vi la 2 don vi va neu ta doi chu so hang tram cho hang don vi thi duoc so moi lon hon so ban dau la 198 don vi

mot so co hai chu so biet tong cac chu so cua no la 8 hieu cac chu so cua cua no la 4 va chu so hang chuc lon hon hang don vi so do la so nao

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

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 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

- 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)