Ответы и объяснения

2014-02-14T15:45:39+04:00
(5 1/14-1 9/14) - (2 11/14+5/14)= 6 4/7
5 1/14-1 9/14= 71/14-23/14=48/14
2 11/14+5/14=39/14+5/14=44/14
48/14+44/14=92/14=6 8/14=6 4/7