Haakjesregel (intermezzo)

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Werk de haakjes weg

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

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Werk de haakjes weg

Verbetersleutel

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