Найдите значение суммы: 1)-3/7+(-2 5/9 2)-3/7+(-5/6) 3)-5/12+(2/15) 4)-3 3/14+(-1 4/63)

-0,37-0,84=-1,21
-3 7/9 -2 5/9=-6 3/9=6 1/3
-3/7+5/6=-18/42+35/42=17/42
-5/12-2/15=-25/60-8/60=-33/60
-13 3/14- 1 4/63=-185/14-67/631665/126-134/126=1799/126=14 35/126=14 5/18