express decimal in p/q form 3.127 bar
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let x=3.127127......
10x=31.271271.....
100x=312.7127......
1000x=3127.127127......
1000x-x=3127.127127.....-3.127127......
=>999x=3124
=>x=3124/999
10x=31.271271.....
100x=312.7127......
1000x=3127.127127......
1000x-x=3127.127127.....-3.127127......
=>999x=3124
=>x=3124/999
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