Выполните действия:
1)2,9+(-6,1)=
2)-5,4+12,2=
3)-1 1/6+(-2 3/8)=
4)-6,7+6,7=
5)8,5-(-4,6)=
6)3,8-6,3=
7)-4,2-(-5)=
8)-8/15-5/6=

1)   =2,9-6,1= - (6,1-2,9)= - 3,22)   =12,2-5,4=6,83)   = - (1 1/6+2 3/8)= - (1 4/24+2 9/24)= - 3 13/244)   =05)   =8,5+4,6=13,16)   = -(6,3-3,8)= - 2,57)   = 5-4,2=0,88)   = -(8/15+5/6)= - (16/30+25/30)= - 41/30= - 1 11/30