Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(-(+2)+(-3)-(+5)+(+5)+(-2)=-2-3-5+5-2=-7\)
2. \(9-9+1-3-6=-8\)
3. \(-(-2)+(-4)+(+8)-(+7)+(+4)=+2-4+8-7+4=3\)
4. \(7-8+6-4+3=4\)
5. \(-(-2)-(-5)+(+7)+(+5)+(-3)=+2+5+7+5-3=16\)
6. \(-(+2)+(-8)-(+9)-(-4)-(-3)=-2-8-9+4+3=-12\)
7. \(+(+4)-(-7)-(+8)-(+5)-(+2)=+4+7-8-5-2=-4\)
8. \(3-3-2+5+6=9\)
9. \(+(+1)+(-4)-(+9)-(+3)-(+1)=+1-4-9-3-1=-16\)
10. \(5-6+7-5-4=-3\)
11. \(9-8+3-3-4=-3\)
12. \(+(-7)-(-2)-(+5)+(-7)+(+3)=-7+2-5-7+3=-14\)