25,5-3,4+7,28+25,5+34: 10-0,728*10+2,85

-25.5-3.4+7.28+25.5+34:10-0.728*10+2.85=2.85
34:10=3.4
0.728*10=7.28
-25.5-3.4=-28.9
-28.9+7.28=-21.62
-21.62+25.5=3.88
3.88+3.4=7.28
7.28-7.28=0
0+2.85=2.85