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(-15)-(-2)=(-15)+2=(-13) Spr. (-13)+(-2)=(-15)
(-3)-(-7)=(-3)+7=4 Spr. 4+(-7)=(-3)
4-13=(-9) Spr. (-9)+13=4
5-(-22)=5+22=27 Spr. 27+(-22)=5
(-15)-(-15)=(-15)+15=0 Spr. 0+(-15)=(-15)
11.
Na czerwono ponumerowałam komnaty
Obliczenia
1 komnata: -3-5=-8
2 komnata: 1-(-7)=1+7=8
3 komnata: -2-(-6)=-2+6=4
4 komnata: 7+(-2)=5
5 komnata: 5-9=-4
6 komnata: 9-23=-14
7 komnata: -3-(-2)=-3+2=-1