Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

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