Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(8+1+3-1-6=5\)
2. \(+(+3)-(-6)+(+2)+(-5)-(-8)=+3+6+2-5+8=14\)
3. \(-8-2+3+6-7=-8\)
4. \(-(+8)-(-8)-(-2)-(+8)-(-5)=-8+8+2-8+5=-1\)
5. \(-(+9)+(-1)-(+6)+(+5)+(-1)=-9-1-6+5-1=-12\)
6. \(+(-5)-(-6)-(-1)-(-3)-(+9)=-5+6+1+3-9=-4\)
7. \(-2+1+1-4+2=-2\)
8. \(4-8+7-7+7=3\)
9. \(-1-1+1+8+4=11\)
10. \(-(+1)-(+2)-(+7)+(-2)-(+4)=-1-2-7-2-4=-16\)
11. \(-6-9-2-3-5=-25\)
12. \(-(+6)-(+1)+(+3)-(-6)+(-9)=-6-1+3+6-9=-7\)