من عجائب الرقم 8
1 × 8 + 1 =9
12 × 8 + 2 =98
123 × 8 + 3 =987
1234 × 8 + 4 =9876
12345 × 8 + 5 =98765
123456 × 8 + 6 =987654
1234567 × 8 + 7 =9876543
12345678 × 8 + 8 =98765432
123456789 × 8 + 9 =987654321
من عجائب الرقم 9
987654321 × 9 = 8888888889
98765432 × 9 = 888888888
9876543 ×...