إكتشف جمال الرياضيات

السلام عليكم ..إكتشف جمال الرياضيات:

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
     
1 * 9 + 2 = 11
12 * 9 + 3 = 111
123 * 9 + 4 = 1111
1234 * 9 + 5 = 11111
12345 * 9 + 6 = 111111
123456 * 9 + 7 = 1111111
1234567 * 9 + 8 = 11111111
12345678 * 9 + 9 = 111111111
    
9 * 9 + 7 = 88
98 * 9 + 6 = 888
987 * 9 + 4 = 8888
9876 * 9 + 3 = 88888
98765 * 9 + 2 = 888888
987654 * 9 + 1 =8888888
9876543 * 9 + 0 = 88888888
   
1 × 1 = 1
11× 11 = 121
111 × 111 = 12321
1111 × 1111 = 1234321
11111 × 11111 = 123454321
111111 × 111111 = 12345654321
1111111 × 1111111 = 1234567654321
11111111× 11111111 = 123456787654321
111111111 × 111111111 = 12345678987654321