Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(+(+8)-(+1)-(+1)+(+3)+(+7)=+8-1-1+3+7=16\)
2. \(9-1+2-2-4=4\)
3. \(-9+2+4+1+6=4\)
4. \(+(+3)-(-3)-(+4)-(-1)-(-3)=+3+3-4+1+3=6\)
5. \(-8+2+6-8-4=-12\)
6. \(-(-4)-(-9)-(+4)-(-9)+(+8)=+4+9-4+9+8=26\)
7. \(-(-4)+(-7)+(-1)+(+1)-(+9)=+4-7-1+1-9=-12\)
8. \(-8-4+7-5-7=-17\)
9. \(-(-7)+(-5)-(+9)-(+7)-(+8)=+7-5-9-7-8=-22\)
10. \(3-5+4+7-6=3\)
11. \(-(-5)-(+2)+(+8)-(+9)+(+2)=+5-2+8-9+2=4\)
12. \(+(+9)-(-9)+(+5)+(-5)+(+4)=+9+9+5-5+4=22\)