Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(-7-3+4-2+7=-1\)
2. \(+(-1)+(-7)+(+8)+(-3)+(+5)=-1-7+8-3+5=2\)
3. \(-(-2)-(-9)-(+8)-(+5)+(+3)=+2+9-8-5+3=1\)
4. \(3-2+6+8+8=23\)
5. \(-(+7)+(-6)-(+2)-(+4)-(-3)=-7-6-2-4+3=-16\)
6. \(-6-2+2-5+4=-7\)
7. \(+(+5)-(-6)+(+5)-(+3)+(+8)=+5+6+5-3+8=21\)
8. \(8-6-2+7-8=-1\)
9. \(2+1+9+6-6=12\)
10. \(1-9+5-6-1=-10\)
11. \(2-3-2-1-2=-6\)
12. \(+(-2)+(-4)-(+4)-(-4)-(+8)=-2-4-4+4-8=-14\)