Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(4-6+6+7-8=3\)
2. \(5-1+3+1+3=11\)
3. \(-(-2)+(+2)+(+5)+(+4)+(+3)=+2+2+5+4+3=16\)
4. \(-3+2+4+3-6=0\)
5. \(-(+9)+(-9)-(+5)+(+1)-(+5)=-9-9-5+1-5=-27\)
6. \(3+1+6-2+1=9\)
7. \(+(-3)-(-6)-(+6)+(+4)-(-9)=-3+6-6+4+9=10\)
8. \(+(+8)+(-6)+(+4)-(+8)-(-7)=+8-6+4-8+7=5\)
9. \(+(-5)-(-8)+(+3)-(+7)+(-1)=-5+8+3-7-1=-2\)
10. \(8-5+2-5+7=7\)
11. \(-7-1+1-8+6=-9\)
12. \(+(-6)+(-9)-(+8)-(-4)+(-4)=-6-9-8+4-4=-23\)