Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(-7+1+1-6+6=-5\)
2. \(-(-2)-(-7)+(+2)+(-5)+(+2)=+2+7+2-5+2=8\)
3. \(-4-8-2-3-9=-26\)
4. \(7-8+3-2+2=2\)
5. \(5-7+2-9-9=-18\)
6. \(-(+6)-(-3)+(+8)-(+1)-(+7)=-6+3+8-1-7=-3\)
7. \(3-3+7+8-9=6\)
8. \(9-3-2+6+8=18\)
9. \(-1-6+8-9+5=-3\)
10. \(-7+2+4+9+1=9\)
11. \(-3-4+4+9+2=8\)
12. \(-5-4+3-4-3=-13\)