Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(-(+4)+(-5)+(+9)-(-3)-(-3)=-4-5+9+3+3=6\)
2. \(+(-5)+(-5)-(+7)-(+1)-(-5)=-5-5-7-1+5=-13\)
3. \(-(-3)-(-1)+(+3)-(-2)+(-8)=+3+1+3+2-8=1\)
4. \(+(+9)+(+1)+(+8)+(-6)-(+7)=+9+1+8-6-7=5\)
5. \(-(-3)-(-5)-(+1)-(+1)-(+4)=+3+5-1-1-4=2\)
6. \(-7-5+5-8-8=-23\)
7. \(+(-2)-(-3)+(+5)+(-9)+(+5)=-2+3+5-9+5=2\)
8. \(+(+6)+(-5)-(+5)+(+4)-(+8)=+6-5-5+4-8=-8\)
9. \(-5-9+6+7+1=0\)
10. \(-(+7)-(+2)+(+3)+(-2)+(-3)=-7-2+3-2-3=-11\)
11. \(2-3+3+8-4=6\)
12. \(+(-3)+(-4)+(+3)-(+2)+(+8)=-3-4+3-2+8=2\)