Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

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