1) Tim so tu nhien nho nhat chia het cho 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8 ; 9
2) Phan tich cac so sau ra thua so nguyen to : 111 ; 1 111 ; 11 111 ; 111 111 ; 1 111 111 ?
tinh gia tri bieu thuc roi phan tich ket qua ra thua so nguyen to
250x5:2=...
phan tich ra thua so nguyen to:....
a, phan tich so 111 ra thua so nguyen to roi tim tap hop cac uoc cua 111.
b, thay dau * boi chu so thich hop:
** . * =111
Phan tich 100 ra thua thua so nguyen to.
Tich C=201x202x203x ... x600 co chua bao nhieu thua so 3 khi phan tich ra thua so nguyen to
phan tich so 32000000 ra thua so nguyen to
phan tich so 1111111111 ra thua so nguyen to
phan tich ra thua so nguyen to 865
phan tich 8840 ra thua so nguyen to (so do cay)