Haakjesregel (intermezzo)

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Werk de haakjes weg

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

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Werk de haakjes weg

Verbetersleutel

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