Haakjesregel (intermezzo)

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Werk de haakjes weg

1. \(-9-(-1)=\)
2. \(-(-4)+(-6)=\)
3. \(-7-(+7)=\)
4. \(-(-8)+(+5)=\)
5. \(-(+6)+(-7)=\)
6. \(8-(-9)=\)
7. \(-(+2)+(-4)=\)
8. \(-(+2)-(-12)=\)
9. \(-(+5)-(-10)=\)
10. \(-(+2)+(-2)=\)
11. \(-(-10)+(+7)=\)
12. \(-(-8)+(-2)=\)

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Werk de haakjes weg

Verbetersleutel

1. \(-9-(-1)=-9+1\)
2. \(-(-4)+(-6)=+4-6\)
3. \(-7-(+7)=-7-7\)
4. \(-(-8)+(+5)=+8+5\)
5. \(-(+6)+(-7)=-6-7\)
6. \(8-(-9)=8+9\)
7. \(-(+2)+(-4)=-2-4\)
8. \(-(+2)-(-12)=-2+12\)
9. \(-(+5)-(-10)=-5+10\)
10. \(-(+2)+(-2)=-2-2\)
11. \(-(-10)+(+7)=10+7\)
12. \(-(-8)+(-2)=+8-2\)