5.26+7+1.74 27.85-(7.85+3.9)
5.6+2.7-3.6 10-2.75-3.25
15.25-3.1+0.65-4.9
30.54-8.8-6.55 23.97-6.34+6.66
2.86+(8.07-5.24) 8-(7.9-5.36)
