2.8+1.7 / 3.5-2.6 = 4.5/0.9 = 4.5:0.9=5
17.5-5.9 / 4.7-1.8 = 11.6/2.9 = 14.6 :2,9=4
18,3-7,5 / 1-0,64 = 10,8/0,36 = 10,8:0,36 = 30
2.8+1.7 / 3.5-2.6 = 4.5/0.9 = 4.5:0.9=5
17.5-5.9 / 4.7-1.8 = 11.6/2.9 = 14.6 :2,9=4
18,3-7,5 / 1-0,64 = 10,8/0,36 = 10,8:0,36 = 30