Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(1-6+7-5+7=4\)
2. \(+(-4)-(-9)-(+5)-(+5)+(+8)=-4+9-5-5+8=3\)
3. \(-1-5+6-6+1=-5\)
4. \(-(-9)+(-5)+(+9)-(-9)-(-9)=+9-5+9+9+9=31\)
5. \(-4-2+9-3-3=-3\)
6. \(2-3+1-3-3=-6\)
7. \(+(+4)-(-3)+(+7)+(+6)+(-5)=+4+3+7+6-5=15\)
8. \(-3-7+9-2+9=6\)
9. \(3-1+9+8-1=18\)
10. \(+(-7)-(+1)+(+8)-(+7)+(-1)=-7-1+8-7-1=-8\)
11. \(+(-8)-(-4)+(-1)+(+1)+(+1)=-8+4-1+1+1=-3\)
12. \(+(-9)-(-7)+(+8)+(-1)-(+2)=-9+7+8-1-2=3\)