Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(8-2-1+1+3=9\)
2. \(-(-7)-(-3)+(+1)+(+7)-(+8)=+7+3+1+7-8=10\)
3. \(-(+3)-(-7)-(+2)+(+6)-(-9)=-3+7-2+6+9=17\)
4. \(+(+7)-(-6)+(+7)-(+8)-(+9)=+7+6+7-8-9=3\)
5. \(9-8+9+1+3=14\)
6. \(-(+7)+(-8)-(-1)-(-2)-(+7)=-7-8+1+2-7=-19\)
7. \(+(+4)-(-5)-(+6)-(-7)-(+2)=+4+5-6+7-2=8\)
8. \(+(+9)+(-9)-(+9)-(+4)-(-8)=+9-9-9-4+8=-5\)
9. \(+(+7)+(-7)+(-2)+(+7)+(+5)=+7-7-2+7+5=10\)
10. \(-8-6+1+1+3=-9\)
11. \(-(+1)-(-7)-(-1)+(+5)-(-8)=-1+7+1+5+8=20\)
12. \(+(-5)+(-1)+(+3)-(-4)-(+9)=-5-1+3+4-9=-8\)