12 = XI
20 = XX
21 = XXI
10 = X
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Các câu hỏi tương tự
nguoi ta xep deu 120 hop banh vao cac thung ' moi thung 5 hop . sau do cac thung duoc chia deu vao cac xe ' moi xe 4 thung . so xe cho 120 hop banh la bao nhieu
viet tat ca cac so co 4 chu so ma tong cac chu so la 3
co bao nhieu so co 3 chu so ma cac chu so la le
so lon nhat co 3 chu so ma tong cac chu so = 24 la
so lon nhat co 3 chu so ma tong cac chu so do bang 24 la so ?
so co 3 chu so khac nhau ma tong cac chu so bang 9 la
hay cho biet co tat ca bao nhieu so co 3 chu so ma cac chu so cua nhung so do deu lon hon 4
co 46 cai coc xep vao cac hop,moi hop 6 cai coc.Hoi xep duoc nhieu nhat la may hop va con thua may cai coc?Neu them 2 cai coc nua thi so coc do xep duoc vao may hop
Co bao nhieu so co 4 chu so ma tong cac chu so co 4 chu so deu la 4