Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(-(+4)-(-8)-(+5)-(-7)-(-8)=-4+8-5+7+8=14\)
2. \(-1-3-1+9-7=-3\)
3. \(-(+2)-(-1)+(+3)+(-8)-(-3)=-2+1+3-8+3=-3\)
4. \(-9-2+6-4-4=-13\)
5. \(-8-3+6-3-6=-14\)
6. \(-1-1+9-1-9=-3\)
7. \(-(-9)-(-5)+(+4)-(-5)+(+9)=+9+5+4+5+9=32\)
8. \(-1-8+5+9+9=14\)
9. \(4-1+8+8+5=24\)
10. \(-(-3)+(+2)-(-1)-(+3)-(+2)=+3+2+1-3-2=1\)
11. \(1-4+7-9-2=-7\)
12. \(+(-7)-(-1)-(+4)-(+9)+(+9)=-7+1-4-9+9=-10\)