a fraçao geratriz de 0,7343434
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x=0,7343434...
1000x=734,3434...
100000x=73434,3434...
100000x-1000x=73434,3434...-734,3434...
99000x=72700
x=72700/99000
x=727/990
1000x=734,3434...
100000x=73434,3434...
100000x-1000x=73434,3434...-734,3434...
99000x=72700
x=72700/99000
x=727/990
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