Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(+(+8)+(-6)-(+2)+(+3)-(+4)=+8-6-2+3-4=-1\)
2. \(9-5+4-2+2=8\)
3. \(-(+7)-(+2)-(+2)+(+9)+(+3)=-7-2-2+9+3=1\)
4. \(-(+1)-(+1)-(+1)-(+7)+(+9)=-1-1-1-7+9=-1\)
5. \(+(+2)-(-2)+(+3)-(-1)-(+8)=+2+2+3+1-8=0\)
6. \(-9-5+4-8-3=-21\)
7. \(+(-3)-(-7)-(+2)-(+5)+(+6)=-3+7-2-5+6=3\)
8. \(+(+5)+(+1)-(+2)+(-5)-(-9)=+5+1-2-5+9=8\)
9. \(-9-6-1+8+7=-1\)
10. \(+(+4)-(-8)-(+9)+(-3)+(+6)=+4+8-9-3+6=6\)
11. \(+(-2)-(+2)-(+3)-(-7)-(+6)=-2-2-3+7-6=-6\)
12. \(-(+1)+(-8)+(+1)+(+8)+(-9)=-1-8+1+8-9=-9\)