(80,3+37,9):100+(68,3-0,86)
80.3+37.9=118.2 118.2 : 100= 1.182 68.3-0.86=67.44 1.182+67.44=68.622
1)80,3+37,9=118,2 2)68,3-0,86=67,44 3)118,2:100=1,182 1,182+67,44=68,622