решить уравнение:

 

          

а)(х-3 12\17)-8 9\17=4 10\14

б)12\53+41\53-к=17\26

 

вычислить:

а)20 1\19-4 12\19-5 17\19

б)19 1\17-8 9\17-3 15\17 

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