1) -1,8:0,9=-2
2)5,75-2=3,75
3)3,75:(-0,1)^2=3,75:0.001=3750
28 -21 =7
13 - 6 =7
8 - 1 = 7
32 - 25 =7
41 - 34 = 7
14 - 7 = 7
13 - 16 =7