Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(+(+4)+(-7)+(+2)-(-4)+(+5)=+4-7+2+4+5=8\)
2. \(+(+6)+(-8)+(+2)+(-2)-(-6)=+6-8+2-2+6=4\)
3. \(+(+1)+(-5)-(+5)+(+8)-(-4)=+1-5-5+8+4=3\)
4. \(+(+3)+(-8)+(+9)+(+9)-(+4)=+3-8+9+9-4=9\)
5. \(5-3+5-5+2=4\)
6. \(-7-1+7-4-9=-14\)
7. \(-(+4)-(-8)-(+3)+(-8)+(-9)=-4+8-3-8-9=-16\)
8. \(+(+7)-(-4)+(+7)+(+2)+(-5)=+7+4+7+2-5=15\)
9. \(+(-3)-(-9)+(+2)+(-4)-(-9)=-3+9+2-4+9=13\)
10. \(4-2+7+9-9=9\)
11. \(-5-4+7-3+1=-4\)
12. \(-4-7-1-3-9=-24\)