Haakjesregel (intermezzo)

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Werk de haakjes weg

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

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Werk de haakjes weg

Verbetersleutel

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