Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(+5)-(-11)=-5+11=6\)
2. \(-2-(-2)=-2+2=0\)
3. \(-(+7)+(-11)=-7-11=-18\)
4. \(-(+1)+(-5)=-1-5=-6\)
5. \(-(+2)+(-3)=-2-3=-5\)
6. \(-2-(-1)=-2+1=-1\)
7. \(-(-11)-(-7)=11+7=18\)
8. \(3-(-3)=3+3=6\)
9. \(-(+2)+(-7)=-2-7=-9\)
10. \(-(-2)+(-4)=+2-4=-2\)
11. \(-(-4)-(-7)=4+7=11\)
12. \(-(+6)-(-9)=-6+9=3\)