1 целая 2/3+1 целая 1/7 с решением  

5/3+8/7=35+24/21=59/21=2целых 17/21

 можно это задание решить двумя способами               2             1                         2           1                           2*7+1*3 1)   1  ------ + 1 ------ = (1+1)+(-------- + -------) = (1+1)+(-----------------) =               3             7                         3            7                                 21           14+3             17 2 + ------------ = 2 --------              21                21        или                2              1            5           8           5*7 + 8*3              35+24 2) 1 ------ + 1 ------- = -------- + ------- = ------------------- = -------------- =            3               7           3           7                  21                        21         59               17  = --------- = 2 --------         21                21       удачи