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0,15=15-1/9=14/9
0,16=16-1/9=15/9
0,17=17-1/9=16/9
0,18=18-1/9=17/9
0,19=19-1/9=18/9
13/9+14/9+15/9. 14/3
----------------------- = ----------- = 14/17
16/9+17/9+18/9. 17/3