Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(-12)+(-3)=+12-3=9\)
2. \(-(+8)-(-9)=-8+9=1\)
3. \(-(+4)+(-4)=-4-4=-8\)
4. \(-(-9)+(-1)=+9-1=8\)
5. \(-(-12)-(+6)=12-6=6\)
6. \(-(+6)+(-8)=-6-8=-14\)
7. \(-(+1)-(-7)=-1+7=6\)
8. \(-10-(+2)=-10-2=-12\)
9. \(-(-5)+(+6)=5+6=11\)
10. \(-(-3)-(+3)=3-3=0\)
11. \(6-(-7)=6+7=13\)
12. \(-(+8)-(-8)=-8+8=0\)