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4,3-7,5 = - 3,2
-4,5-2 1/4 = - 45/10 - 9/4 = - 90/20 - 45/20 = -135/20 = - 6 15/20 = - 6 3/4
-3 1/6-(-5 5/6) = - 19/6 + 35/6 = 16/6 = 2 4/6 = 2 2/3
7 1/3+(-4 5/6) = 22/3 - 29/6 = 44/6 - 29/6 = 15/6 = 2 3/6 = 2 1/3
sumy liczb dodatnich i ujemnych
5 + (-7,5) = - 2,5
różnica dwóch liczb ujemnych
-10 - (- 7,5) = - 2,5