재미있는 숫자(숫자 피라미드)

■ 숫자 피라미드

(0×9)+1=1 (1×9)+2=11 (12×9)+3=111 (123×9)+4=1,111 (1,234×9)+5=11,111 (12,345×9)+6=111,111 (123,456×9)+7=1,111,111 (1,234,567×9)+8=11,111,111 (12,345,678×9)+9=111,111,111 (123,456,789×9)+10=1,111,111,111

(0×9)+8=8 (9×9)+7=88 (98×9)+6=888 (987×9)+5=8,888 (9,876×9)+4=88,888 (98,765×9)+3=888,888 (987,654×9)+2=8,888,888 (9,876,543×9)+1=88,888,888 (98,765,432×9)+0=888,888,888 (987,654,321×9)-1=8,888,888,888

(1×8)+1=9 (12×8)+2=98 (123×8)+3=987 (1,234×8)+4=9,876 (12,345×8)+5=98,765 (123,456×8)+6=987,654 (1,234,567×8)+7=9,876,543 (12,345,678×8)+8=98,765,432 (123,456,789×8)+9=987,654,321

1×1=1 11×11=121 111×111=12321 1,111×1,111=1234321 11,111×11,111=123454321 111,111×111,111=12345654321 1,111,111×1,111,111=1234567654321 11,111,111×11,111,111=123456787654321 111,111,111×111,111,111=12345678987654321

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