a, tim so tu  nhien trong khoang tu 100 den 300 biet rang so do chia cho 4 cho 5 cho 6 deu du 2 nhung so do lai chia het cho 11

b, dung ba chu so 1 ; 2 ; 3 hay viet tat ca cac so tu n hien co ba chu so ma cac chu so khac nhau , chung to rang tat ca cac so tu nhien do dau la hop so

c, tim so tu nhien nho nhat cho bon chu so giong nhau biet rang so do co dung ba uoc deu la o nguyen to

tu ba so doi 1 khac nhau va khac 0 ta lap dc tat ca cac so co 3 Chu so doi 1 khac nhau . Biet rang tong cac so lap dc la 2886 , hieu giua so lon nhat va so be nhat trong cac so lap dc la 495 . Cac chu so do la : .....;......;........(viet cac chu so theo gia tri tang dan )

GIUP MIH NHA MIH GAP LAM

cho 3 chu so khac nhau va khac 0 co the lap duoc bao nhieu so khac nhau tu ba chu so do biet tong chieu cac so do la 3330 hieu so lon nhat va be nhat la 549 tim 3 chu so do

Tim so tu nhien co hai chu so khac nhau . Biet rang: hai chu so cua so do deu la so nguyen to . Tich cua so do voi cac chu so cua no la so co 3 chu so giong nhau duoc tao thanh tu chu so hang don vi cua so do.

tim cac so co sau chu so - biet cac chu so thuoc lop don vi deu la 1 , cac chu so thuoc lop nghin la cac chu so chan khac nhau , khac 0 va nho hon 8.co bao nhieu so ?

So nho nhat co 3 chu so khac nhau ma khi nhan cac chu so voi nhau thi cung bang cac chu so ay cong voi nhau. So do la 

cho 5 so 0,1,2,3,4 tu cac so ay co the lap dc bao nhieu so tu nhien:

a co 5 chu so gom ca 5 chu so ay 

b co 4 chu so cac chu so khac nhau

c co 3 chu so cac chu so khac nhau

d co 3 chu so cac chu so co the giong nhau

so lon nhat co cac chu so khac nhau ma tong cua cac chu so do la 26 . tim 2 so do