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2014-09-16T23:22:53+03:00
2,(3)=(23-2)/9=21/9=7/3
1,(6)=(16-1)/9=15/9=5/3
(7/3 * 2 -5/3) : 25/10 - 20/100= 9/3*10/25-20/100=30/25-1/5=6/5-1/5=5/5=1
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