-3,1/2 + 2,3/4 = -3,0.5 + 2,0.75 = -0.5 + 0.75 = 0.25
1,7 (-15/34) = 1.7 (-0.441) = -0.7517
-4,2 - (-5,9) = -4.2 + 5.9 = 1.7
6,1/3 : 4,2/3 = 6.33 / 4.67 = 1.35
-3,1/2 + 2,3/4 = -3,0.5 + 2,0.75 = -0.5 + 0.75 = 0.25
1,7 (-15/34) = 1.7 (-0.441) = -0.7517
-4,2 - (-5,9) = -4.2 + 5.9 = 1.7
6,1/3 : 4,2/3 = 6.33 / 4.67 = 1.35