tu 100 den 999 can bao nhieu chu so
tu 1 den 999.Hoi
a)Co bao nhieu chu so 2
b)Co bao nhieu chu so 0
tu 1 den 999. chu so 3 duoc lap lai bao nhieu lan
tu 1 den 9999 can bao nhieu chu so 2
Tu 1 den 9999 can co bao nhieu chu so 2
nguoi ta danh so nha tren 1 day pho tu so 1 den 121. hoi so chu so can dung la bao nhieu
khi viet tat ca cac so tu nhien tu 30 den 50 can dung tat ca bao nhieu chu so
mot quyen sach co 314 trang.nguoi ta danh so tu 1 den 314.hoi can phai viet bao nhieu chu so?
muon viet tat ca cac so tu nhien tu 100 den 1999 can bao nhieu chu so 5