Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(-(-5)-(-4)-(-1)+(+5)+(+3)=+5+4+1+5+3=18\)
2. \(2-6-2-6+5=-7\)
3. \(-(-6)-(-2)+(+8)+(+5)+(-2)=+6+2+8+5-2=19\)
4. \(+(-8)+(-1)+(-1)-(-5)-(-6)=-8-1-1+5+6=1\)
5. \(8-4+5-2+9=16\)
6. \(4+2+1+7-8=6\)
7. \(-2-1+2-2-5=-8\)
8. \(-2-9+1+2-5=-13\)
9. \(1-7+8+5-8=-1\)
10. \(6+2+9-9+7=15\)
11. \(-6-3+3+3+3=0\)
12. \(+(+4)-(-8)-(+5)+(+1)-(-3)=+4+8-5+1+3=11\)