Haakjesregel (intermezzo)

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Werk de haakjes weg

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

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Werk de haakjes weg

Verbetersleutel

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