9-0.4*6.1-4.6+4.1-2.85*3.2-3.12
-6,18 ..................................................................................................................
1.0,4*6,1=2,44 2.9-2,44=6,56 3.6,56-4,6=1,96 4.1,96+4,1=6,06 5.2,85*3,2=8,12 6.6,06-8,12=-2,06 7.-2,06-3,12=-5,18