Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(1-1+9+6-8=7\)
2. \(-7-7+5-8-3=-20\)
3. \(+(+9)-(+1)+(-1)+(+3)-(-6)=+9-1-1+3+6=16\)
4. \(-(-8)-(-6)+(+2)-(-7)+(+5)=+8+6+2+7+5=28\)
5. \(-9-7+7+8+6=5\)
6. \(2-6+4+6-9=-3\)
7. \(-6-9+9-4+7=-3\)
8. \(-(+9)-(-2)+(+9)+(+2)+(+7)=-9+2+9+2+7=11\)
9. \(4-3+3-4+5=5\)
10. \(-(+4)-(-2)-(+8)-(-5)-(-8)=-4+2-8+5+8=3\)
11. \(5+2+5+8+2=22\)
12. \(6-8+1+2-3=-2\)