Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(3-2-2-9+1=-9\)
2. \(-(-6)+(-9)-(-1)+(+4)-(+1)=+6-9+1+4-1=1\)
3. \(+(-6)-(-4)+(-1)-(-9)-(-6)=-6+4-1+9+6=12\)
4. \(6+1+5+3+3=18\)
5. \(-1+1+8-8+5=5\)
6. \(-(-2)+(+2)+(+4)-(+2)-(-7)=+2+2+4-2+7=13\)
7. \(5-7+6-2-5=-3\)
8. \(7-6+7+9+3=20\)
9. \(2-5-1-1+7=2\)
10. \(3-8-1+6-5=-5\)
11. \(-5+1-1+1-9=-13\)
12. \(-3+2+7-3+1=4\)