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2013-03-14T20:44:56-03:00

x=6,888....

10x=68,888...

10x-x=68,888...-6,888...

9x=62

x=62/9

 

se não for  dizima:

x=6,888

1 000x=6888

x=6 888/ 1 000=861/125

1 5 1
2013-03-14T20:49:00-03:00

x=6,888

10x=68,888

10x=68,888

  - x =  6,888

 9x=62

x=62/9

1 5 1