1) -9 + 6 = -3
5) -2,3 + 1,4 = -0,9
9) -7 + 12 = 5
13) -1,7 + 3 = 1,3
17) -6 + (-5) = -11
21) -1/4 + (-1/6) = -1/4 - 1/6 = -3/12 - 2/12 = -5/12
25) -5/16 + (-7/16) = -5/16 - 7/16 = -12/16 = -3/4
29) -13/16 + (-9/32) = -13/16 - 9/32 = -26/32 - 9/32 = -35/32 = -1 3/32