Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(-8-5+5-6+3=-11\)
2. \(2-1+9+4-8=6\)
3. \(9-2+9+7-5=18\)
4. \(7-5-2-3+5=2\)
5. \(-1-6+7+8+4=12\)
6. \(-(-8)-(-7)-(+4)-(-9)+(+3)=+8+7-4+9+3=23\)
7. \(+(+4)+(-3)-(+7)+(+5)-(+1)=+4-3-7+5-1=-2\)
8. \(+(-7)-(-4)-(+7)-(-6)+(+6)=-7+4-7+6+6=2\)
9. \(+(+8)+(-8)-(-1)-(+1)-(+1)=+8-8+1-1-1=-1\)
10. \(+(-1)-(-1)+(+5)+(+4)+(-2)=-1+1+5+4-2=7\)
11. \(8-1+8+2+1=18\)
12. \(-(+4)+(-4)-(+5)-(+8)+(-2)=-4-4-5-8-2=-23\)