(-12,6* 1 1/9+10,8): 6 6/7+2 3/10 = (-12 6/10*10/9+10 8/10):48/7+13/10 =
= (-126/10*10/9+108/10)*7/48+13/10 =(-140/10+108/10)*7/48+13/10
= -16/5*7/48+13/10 = -7/15+13/10 = -14/30+39/30 = 25/30 = 5/6
1) -126/10*10/9 = -14
2) -140/10+108/10 = -32/10 = -16/5
3) -16/5*7/48 = -7/15
4) -14/30+39/30 = 25/30 = 5/6