Haakjesregel (intermezzo)

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Werk de haakjes weg

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

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Werk de haakjes weg

Verbetersleutel

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