Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(9-1-2+2-8=0\)
2. \(-2-2+4+1+7=8\)
3. \(-6-2+6-8+2=-8\)
4. \(-(-8)-(-1)-(+3)+(-3)-(-8)=+8+1-3-3+8=11\)
5. \(-(+8)-(-9)-(+3)-(-8)-(+2)=-8+9-3+8-2=4\)
6. \(+(+4)-(+2)+(+1)-(-6)+(-6)=+4-2+1+6-6=3\)
7. \(-9-8+9+9-7=-6\)
8. \(+(+2)-(-8)+(+4)+(+8)-(+5)=+2+8+4+8-5=17\)
9. \(6-3-1+5+4=11\)
10. \(-7-3+2-5+9=-4\)
11. \(+(-2)-(-4)+(+9)+(+9)-(+3)=-2+4+9+9-3=17\)
12. \(+(-2)+(-6)-(+9)-(-1)-(+8)=-2-6-9+1-8=-24\)