Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(+1)+(-2)=-1-2=-3\)
2. \(-(-11)+(-7)=+11-7=4\)
3. \(8-(-8)=8+8=16\)
4. \(-(+3)-(-10)=-3+10=7\)
5. \(-(-11)+(+5)=11+5=16\)
6. \(-(-6)+(-8)=6-8=-2\)
7. \(-(+7)-(-12)=-7+12=5\)
8. \(-(+1)-(-6)=-1+6=5\)
9. \(-11-(+3)=-11-3=-14\)
10. \(-(-8)-(+6)=8-6=2\)
11. \(-(-10)-(+3)=10-3=7\)
12. \(-(+4)+(-4)=-4-4=-8\)