數의 마술?

수(數)의 마술? 묘하군요 !!                                  1 x 8 + 1 = 9                          12 x 8 + 2 = 98                        123 x 8 + 3 = 987                      1234 x 8 + 4 = 9876                    12345 x 8 + 5 = 98765                  123456 x 8 + 6 = 987654                1234567 x 8 + 7 = 9876543              12345678 x 8 + 8 = 98765432            123456789 x 8 + 9 = 987654321                            1 x 9 + 2 = 11                          12 x 9 + 3 = 111                        123 x 9 + 4 = 1111                      1234 x 9 + 5 = 11111                    12345 x 9 + 6 = 111111                  123456 x 9 + 7 = 1111111                1234567 x 9 + 8 = 11111111              12345678 x 9 + 9 = 111111111            123456789 x 9 +10= 1111111111                            9 x 9 + 7 = 88                          98 x 9 + 6 = 888                        987 x 9 + 5 = 8888                      9876 x 9 + 4 = 88888                    98765 x 9 + 3 = 888888                  987654 x 9 + 2 = 8888888                9876543 x 9 + 1 = 88888888              98765432 x 9 + 0 = 888888888                            다음 대칭을 보세요:                         1 x 1 = 1                       11 x 11 = 121                     111 x 111 = 12321                   1111 x 1111 = 1234321                 11111 x 11111 = 123454321               111111 x 111111 = 12345654321             1111111 x 1111111 = 1234567654321           11111111 x 11111111 = 123456787654321         111111111 x 111111111 = 12345678987654321