Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(+(-8)-(+2)-(+1)+(-5)-(+7)=-8-2-1-5-7=-23\)
2. \(-(-3)+(-7)-(+6)+(-8)+(+6)=+3-7-6-8+6=-12\)
3. \(6+1+8-5-9=1\)
4. \(8-8+6+3+6=15\)
5. \(+(-6)-(-8)-(+4)-(-1)-(+5)=-6+8-4+1-5=-6\)
6. \(+(+3)-(-2)+(-1)+(+9)-(+3)=+3+2-1+9-3=10\)
7. \(+(+9)+(+2)-(+1)+(+8)+(-2)=+9+2-1+8-2=16\)
8. \(-(-2)+(-8)-(-2)+(+1)+(-1)=+2-8+2+1-1=-4\)
9. \(-2-9+2+2+1=-6\)
10. \(+(-5)-(+1)-(+4)-(+2)+(+4)=-5-1-4-2+4=-8\)
11. \(+(-9)+(-8)-(+9)+(-4)-(-9)=-9-8-9-4+9=-21\)
12. \(7-8+8-6+2=3\)