Haakjesregel (intermezzo)

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Werk de haakjes weg

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

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Werk de haakjes weg

Verbetersleutel

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