Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(+(-3)-(+1)-(+1)-(-3)+(-6)=-3-1-1+3-6=-8\)
2. \(-(-3)-(-2)-(+7)-(+9)-(+2)=+3+2-7-9-2=-13\)
3. \(-8+1+3-1-1=-6\)
4. \(7-5+7+4+8=21\)
5. \(+(-8)+(-9)+(+6)+(-3)+(-7)=-8-9+6-3-7=-21\)
6. \(-2-6+1+7+8=8\)
7. \(+(+6)-(-9)+(+6)+(-3)+(+3)=+6+9+6-3+3=21\)
8. \(-9+1+5-7-9=-19\)
9. \(+(-4)-(-7)-(+4)+(+3)+(-6)=-4+7-4+3-6=-4\)
10. \(-5-4+1-2-9=-19\)
11. \(7-3-2-6-4=-8\)
12. \(5+1+6-1+3=14\)