.・・・000000000000000001

.・・・00000000000000001

.・・・0000000000000002

.・・・000000000000003

.・・・00000000000005

.・・・0000000000008

.・・・000000000013

.・・・00000000021

.・・・0000000034

・・・・・・・・・

＝1/109

-100x+10x+x=-109x=-1

x=1/109

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