22/13-21/15-6/2+(-1/2)

Расставим действия:

         1         2         3

22/13 - 21/15 - 6/2 + (- 1/2) = - 3 27/130;

1) 22/13 - 21/15 = 330 /195 - 273/195 = 57/195;

2) 57/195 - 6/2 = 114/390 - 1170/390 = - 1056/390;

3) - 1056/390 - 1/2 = - 1056/390 - 195/390 = - 1251/390 = - 417/130 = - 3 27/130.