Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(-(-7)-(+1)-(+3)-(-2)+(-4)=+7-1-3+2-4=1\)
2. \(5-5-2+4-3=-1\)
3. \(7-7+9-3-2=4\)
4. \(-(+7)-(+2)+(+8)+(+6)-(-8)=-7-2+8+6+8=13\)
5. \(4-4+7+8-9=6\)
6. \(-8-3+3-4+9=-3\)
7. \(-(-5)+(-2)+(+7)-(-4)-(+7)=+5-2+7+4-7=7\)
8. \(1-3+2+9-9=0\)
9. \(-(-2)-(-7)-(-2)+(+4)-(+5)=+2+7+2+4-5=10\)
10. \(-(-3)-(-8)-(+4)+(+2)+(-9)=+3+8-4+2-9=0\)
11. \(+(-6)-(-4)+(+5)-(-9)-(+8)=-6+4+5+9-8=4\)
12. \(-6-5+9+9+6=13\)