奇妙的数字

奇妙的数字（1）：

 

                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

 

奇妙的数字（2）：



                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



奇妙的数字（3）：

              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



奇妙的数字（4）：

                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