Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(+(-6)-(-7)-(+4)+(-8)+(+7)=-6+7-4-8+7=-4\)
2. \(-2-2+2+8+8=14\)
3. \(+(+7)-(-9)+(+9)+(+5)+(-2)=+7+9+9+5-2=28\)
4. \(+(-1)-(+1)-(-1)+(+5)-(-4)=-1-1+1+5+4=8\)
5. \(+(+7)-(-4)+(+4)-(-3)+(-7)=+7+4+4+3-7=11\)
6. \(-7-8+6-6+6=-9\)
7. \(-9-2+1-8+9=-9\)
8. \(+(-3)-(-3)+(+8)+(-5)+(-8)=-3+3+8-5-8=-5\)
9. \(7-1+9+4-1=18\)
10. \(-(+3)+(+1)-(+9)+(+4)+(+4)=-3+1-9+4+4=-3\)
11. \(8-6+2-9-6=-11\)
12. \(3-4+3-3-2=-3\)