Haakjesregel (intermezzo)

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Werk de haakjes weg

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

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Werk de haakjes weg

Verbetersleutel

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