Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(5-5+2+6+7=15\)
2. \(-(-4)-(-7)+(+7)-(-7)+(-6)=+4+7+7+7-6=19\)
3. \(-(-5)+(-9)-(+9)-(-4)-(-9)=+5-9-9+4+9=0\)
4. \(9-2-2-1-2=2\)
5. \(-2-7+9-9-6=-15\)
6. \(7-9-2-1-1=-6\)
7. \(-(-4)+(-2)-(+9)-(-9)+(-6)=+4-2-9+9-6=-4\)
8. \(-(+6)-(-5)+(+4)+(+2)-(-9)=-6+5+4+2+9=14\)
9. \(-5-4+2+9-6=-4\)
10. \(+(+7)-(+1)-(+6)-(+9)+(+7)=+7-1-6-9+7=-2\)
11. \(-(+2)+(-1)+(-1)-(+3)+(-9)=-2-1-1-3-9=-16\)
12. \(-(-8)+(-4)+(+2)-(-9)+(-1)=+8-4+2+9-1=14\)