81 4/10 - 59.57:(5.46+1.94)
1. 5,46+1,94=7,4
2. 59,57:7,4=8,05
3. 81,4-8,05=73,35
81.4-59.57/(5.46+1.94)=81.4-59.57/7.4=81.4-8.05=73.35