thay dau * bang nhung chu so thich hop: **+**=*97
thay xmy bang cac chu so thich hop de 21x7y chia het cho ca 5 va 9
thay dau * bang nhung chu so thich hop
**+**=*97
thay dau *bang nhung chu so thich hop
** + ** = *97
Thay các chữ boi cac chu so thich hop
a, ab+bc+ca=abc
b,abc+ab+a=874
minh dang can ket qua
Thay cac chu so a,b,c boi ca chu so thich hop de so A= 579abc chia het cho ca ba so 5;7;9
thay dau dau sao bang nhung chu so thich hop de co phep tinh dung 92 nhan sao sao=sao sao sao
thay dau * bang nhung chu so thich hop
** +** =*97
moi ve cua phep tinh deu co dau gach tren dau
Thay dau * boi chu so thich hop de co 517**chia het cho ca ba chu so 6,7,9
