Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(+(+9)+(-8)+(+2)+(-3)+(-8)=+9-8+2-3-8=-8\)
2. \(-(+6)-(+2)-(+4)+(-9)-(+8)=-6-2-4-9-8=-29\)
3. \(-(+3)-(-2)-(+4)-(-9)-(-2)=-3+2-4+9+2=6\)
4. \(+(+7)+(-6)-(+3)-(+1)+(-4)=+7-6-3-1-4=-7\)
5. \(+(+6)-(-7)-(+6)-(-2)-(-5)=+6+7-6+2+5=14\)
6. \(-(-9)+(-3)-(+4)+(+5)-(+7)=+9-3-4+5-7=0\)
7. \(+(+1)-(-8)+(-2)-(+1)+(+8)=+1+8-2-1+8=14\)
8. \(1-7+4-3+1=-4\)
9. \(-4-3+8-8+5=-2\)
10. \(4-5-1-3-5=-10\)
11. \(+(-2)-(-8)+(+9)+(-7)+(+5)=-2+8+9-7+5=13\)
12. \(-(-6)-(-1)-(+1)-(-8)-(+4)=+6+1-1+8-4=10\)