tim cac so co hai chu so , biet rang neu lay chu so hang chuc nhan co chu so hang don vi chia cho 3 thi bang hieu cua chu so hang chuc va 1

tim so be nhat co hai chu so ma tich va thuong cua chu so hang don vi voi chu so hang chuc bang deu bang 3 

 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?

tim so tu nhien co 3 chu so biet rang chu so hang don vi chia chu so hang chuc duoc thuong la 3 du 1 chu so hang tram bang tong 2 so con lai

Tim so tu nhien co 3 chu so khac nhau, biet rang: chu so hang tram chia cho chu so hang chuc duoc 2 du 2; con chu so hang don vi bang hieu cua hai so do

tim so co chu so biet trung binh cong cua 3 chu so bang 2 va chu so hang tram bang tong cac chu so hang chuc va hang don vi 

tim so co 3 chu so lon nhat co cac chu so khac nhau ma cac chu so hang don vi bang trung binh cong cua chu so hang tram va chu so hang chuc . tim so do

So be nhat co 3 chu so khac nhau ma, thuong cua phep chia chu so hang tram cho chu so hang chuc bang thuong cua phep chia chu so hang chuc cho chu so hang don vi...............

khi doi cho chu so hang chuc va chu so hang don vi cua 1 so cho nhau thi ta duoc 1 so moi nho hon so ban dau 26 don vi.tim so ban dau biet rang trung binh cong cac chu so cua no bang 7 va so do co 3 chu so