Haakjesregel (intermezzo)

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Werk de haakjes weg

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

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Werk de haakjes weg

Verbetersleutel

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