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6 strona 68
-16+48+=32
16+(-32)=-16
16+(-48)=-32
-2,5+=-10
-2,5+(-7,5)=10
2,5+(-5)=-2,5
-1/3+1/3=0
1/3+(-4/3)=-1
-1/3+2/3=1/3
Ćwiczenie19strona 71
-17-10=-27
-17-(-10)=-7
3,75-4=-0,5
3,75-(-4)=7,75
-3,75-(-4)=-0,25
-3,75-4=-7,75
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