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1/2 = 0,5
-15,5 *0,5 = -7,75
-15,5 - 0,5 = -16
-15 i 1/2 - 1/2 = -16
-15*-1/2=7,5
-15-1/2=-15,5
-15-(-1/2)=-14,5
chyba że roznica wynikow to:
-7,5-7,5=-15
7,5-(-7,5)=15