tim chu so tan cung cua tich sau 1x3x5x7x9x...x2007x2009
1 nguoi mua 50 qua trung la trung ga va vit het 119000 dong. gia moi qua trung ga la 2500 , gia moi qua trung vit gia 2200. hoico may qua trung ga
co bao nhieu so le co 3chu so deu chia het cho 9
cho phan so 97/151 . hoi phai chuyen tu tu so xuong mâu so may don vi de duoc phan so 3/5