-17.2 + (-5.9) = -23.1-0.48 + 0.76 = 0.28-4 5/7 + (-1 6/7) = -6 3/7-4/5 + (-4/7) = -33/35-4 9/14 + (-3 4/21) = -8 17/42
-5.1 + 3.5 = -1.61.68 + (-1.68) = 0-1 2/5 + (-3 4/5) = -5 1/5-3/4 + (-12/3) = -13/4-3 11/20 + (-2 10/30) = -4 11/15
-17.2 + (-5.9) = -23.1
-0.48 + 0.76 = 0.28
-4 5/7 + (-1 6/7) = -6 3/7
-4/5 + (-4/7) = -33/35
-4 9/14 + (-3 4/21) = -8 17/42
-5.1 + 3.5 = -1.6
1.68 + (-1.68) = 0
-1 2/5 + (-3 4/5) = -5 1/5
-3/4 + (-12/3) = -13/4
-3 11/20 + (-2 10/30) = -4 11/15